The correct answer is C) Great Britain often used religion as a way to categorize people.
The role that Great Britain played in India's history of religious tension was that "Great Britain often used religion as a way to categorize people."
That is true, and also the role that Britain played in the partition of India, due to religious conflicts. In 1947, the Indian territory controlled by England split into two different territories: India and Pakistan. The religion conflict between Muslims and Hinduist ended up creating a division in which the followers of Islam formed Pakistan and the followers of Hinduism remained in India.