The insurance sector in India is regulated by the Insurance Regulatory and Development Authority of India (IRDAI). It is a statutory body established under the Insurance Regulatory and Development Authority Act, 1999. The IRDAI is responsible for regulating, promoting and ensuring orderly growth of the insurance sector in India. The functions of the IRDAI include granting licenses to insurance companies, regulating the premiums charged by insurance companies, protecting the interests of policyholders, and ensuring that insurance companies maintain adequate solvency margins. Hence, option C is correct.