The ganges river is most important to over 1 billion a)mongolians chinese b)communists c)followers of hinduism d)followers of buddhism

C) followers of Hinduism

Explanation:

The Ganges River is a river that flows through India and Bangladesh. The river begins in the western Himalayas and empties into the Bay of Bengal. The river is extremely important to over one billion followers of Hinduism who worship it as the goddess Ganga. However, the Ganges is also the most polluted river in the world, mainly due to the large numbers of people that live  close to it.

i feel the answer is 6.