What is likely reason that India supported East Pakistan's effort to gain independence from Pakistan?

AEast Pakistan agreed with India's policy of nonalignment
BIndia and Pakistan were in conflict
CEast Pakistan was close to India's largest cities
DIndia's population was mostly Hindu

Verified Answer :

India and Pakistan are often in conflict, or have a high potential for conflict. They compete in many ways, and it is likely that the reason for India's support was that this would weaken Pakistan - option b)

What is likely reason that India supported East Pakistan's effort to gain independence from Pakistan?

b) India and Pakistan were in conflict