Size and extent

The governing concept is that local solar time changes primarily with longitude. Earth rotates from west to east, so locations at different longitudes face the Sun at different moments. The standard relationship is approximately 1 hour for every 15 degrees of longitude, or 4 minutes for each degree. Thus India's east-west longitudinal extent can produce local-time differences, even though the country uses one standard national time for practical administration. Option A is correct. Latitude mainly expresses north-south position and influences climate, but it does not directly establish clock time. Area and coastline are measurements or geographic features, not time standards.

A coastline gives a country access to sea routes, ports and marine resources, and it also matters for coastal defence and maritime security. These economic and security roles make India’s long coastline strategically important. Option A is correct. Local time is related mainly to longitude, not coastline length.

Local time is directly related to longitude: Earth rotates 360° in about 24 hours, so the average time difference is four minutes per degree of longitude. Latitude affects the angle of incoming sunlight and therefore influences temperature. Area is used to calculate population density: population divided by area. Coastline length does not directly determine local time, so option A is the least direct pair.

India's large area includes regions with different relief, climates, soils, water availability and resources. These differences shape settlement, farming, transport and other needs, so regional plans must account for local conditions. Thus, large area and regional diversity are most relevant. A world rank, longitude and coastline length alone do not describe the varied needs of inland regions.

A coastline measures the boundary between land and sea, so it relates to maritime access and coastal areas. A land boundary marks contact between a country and its neighbours, so it relates to cross-border contact and boundary management. Though both are measured as lengths, they describe different kinds of contact. Therefore, option A is correct.

The east-west direction corresponds to India's longitudinal extent, while the north-south direction corresponds to its latitudinal extent. The commonly cited figure of about 2,933 km is India's east-west extent. Thus option A is correct; the other two options are boundary lengths, not the country's east-west span.

The governing concept is the distinction between latitudinal and longitudinal extent. Latitudes run from east to west, so measuring the distance between India's northern and southern limits gives the country's north-south extent. India extends for about 3,214 km from north to south, whereas its east-west extent is about 2,933 km. Therefore, the stated figure refers to the north-south linear extent, making option A correct. Option B confuses latitude with longitude and assigns the figure to the wrong direction. Options C and D are unrelated: coastline is a boundary-length measure, while world land share is an area percentage, not a distance.

The governing geographical idea is that a country's physical extent influences its regional orientation and connections. India's long coastline along the Arabian Sea, the Indian Ocean and the Bay of Bengal, together with the Andaman and Nicobar and Lakshadweep island groups, gives it a strong maritime identity. This identity is reflected in sea trade, ports, naval security, fishing, offshore resources and links with other Indian Ocean countries. Hence option A is correct. India is not landlocked, so option C is the opposite of the evidence. It is neither a polar country nor situated in the Western Hemisphere, making options B and D geographically unsuitable.