How can latitude affect vegetation?

Correct answer: It affects temperature and photoperiod

Direct answer: Option C, latitude affects temperature and photoperiod. Latitude is the angular distance north or south of the Equator. Because Earth is curved and tilted, latitude influences the angle of incoming sunlight, seasonal heating and the length of daylight. These conditions affect temperature, moisture patterns and the period during which plants receive light, so they influence vegetation types and growth cycles. Option A is wrong because latitude does not build roads. Option B is wrong because markets are human-economic institutions, not a climatic effect of latitude. Option C is correct: temperature and photoperiod are relevant links between latitude and vegetation. Option D is wrong because latitude does not always make soil marshy; marsh formation depends on drainage, relief, water and other conditions. The chain to remember is latitude → solar angle and day length → climate → vegetation. Do not confuse latitude with altitude: latitude is position north or south, while altitude is height above sea level.