Manipur has a significant proportion of its population belonging to:

Scheduled Tribes
Scheduled Castes
Other Backward Classes
Religious minorities

The correct answer is Scheduled Tribes.

Scheduled Tribes are indigenous peoples who are considered to be socially and economically backward. They are listed in the Indian Constitution as a separate group from other citizens, and they are entitled to certain special privileges, such as reservations in government jobs and educational institutions.

Manipur has a significant proportion of its population belonging to Scheduled Tribes. According to the 2011 census, 32.8% of the state’s population belonged to Scheduled Tribes. The largest Scheduled Tribe in Manipur is the Meitei, who make up 28.4% of the state’s population. Other major Scheduled Tribes in Manipur include the Kuki, Naga, and Zomi.

Scheduled Tribes are often marginalized and discriminated against in India. They face challenges such as poverty, illiteracy, and lack of access to basic services. However, there has been some progress in recent years in improving the lives of Scheduled Tribes. For example, the government has implemented a number of programs to promote education and employment among Scheduled Tribes.

The other options are incorrect. Scheduled Castes are a group of people who are considered to be socially and educationally backward. Other Backward Classes are a group of people who are considered to be socially and economically backward. Religious minorities are people who belong to religions other than Hinduism, Islam, Christianity, Sikhism, and Buddhism.