In which part of India are the Northern Plains located?

Correct answer: South of the Himalayas

The direct answer is A, south of the Himalayas. The Northern Plains are broad depositional plains formed mainly by the Indus, Ganga and Brahmaputra river systems and their tributaries. They lie immediately south of the Himalayan foothills and extend across much of northern India. Option A is correct because it gives their geographical position. Option B is wrong: southern islands are separate coastal or oceanic landforms. Option C is wrong because the western sea is not the location of the Northern Plains. Option D is wrong because the Deccan Plateau lies much farther south and is a plateau, not the alluvial Northern Plains. Reasoning cue: mountains in the north, alluvial plains immediately below them.