The correct options are
A In the northern regions of India, people eat more wheat-based dishes.
C In the northern regions of India, people wear thicker clothes.
Climate affects not just the geographical aspects of a region but also the lifestyle of people. The northern regions of India are optimum for wheat growth; hence people in these regions eat more wheat-based dishes like roti, parathas as we move towards the Himalayas, the temperature drops. Therefore people of these parts wear thick clothes.