C. There was conflict between its Hindu and Muslim populations.
After gaining independence in 1947, India faced significant challenges, including communal tensions between its Hindu and Muslim populations. The partition of British India into India and Pakistan was marked by violence and mass displacement, leading to ongoing strife and challenges in nation-building. Other factors like poverty, economic challenges, and political instability also contributed to India's struggles in the post-independence period, but the communal conflict was a significant issue.