Farmers in the northern Indo-Gangetic plain of south Asia rely mostly on:

A. Water carried by rivers that drain from the Himalayas
B. Cool air that brings drenching rain
C. Monsoons that bring needed moisture
D. Desert wind that balances the cold moist air from the Himalayas

A?

Yes, A.

To determine the correct answer, we need to understand the conditions experienced by farmers in the northern Indo-Gangetic plain of South Asia and what they rely on for their agriculture. Here's how we can find the answer:

1. Begin by searching for information about the climate and agricultural practices in the northern Indo-Gangetic plain.
2. Look for sources that specifically discuss the water sources utilized by farmers in the region.
3. Evaluate the options provided and match them with the information found.

After conducting the research, we find that the farmers in the northern Indo-Gangetic plain of South Asia heavily rely on water carried by rivers that drain from the Himalayas. These rivers, such as the Ganges, the Indus, and the Brahmaputra, provide a consistent water supply for agriculture in the region. Therefore, the correct answer is A. Water carried by rivers that drain from the Himalayas.