The correct answer is (d). Retail trade.
FDI in retail trade was opened up in 2016, with 100% FDI allowed under the automatic route for single-brand retail trading and 51% FDI under the government route for multi-brand retail trading.
Gambling and betting are illegal in India, and FDI is not allowed in these sectors.
The lottery business is regulated by the states in India, and FDI is allowed in some states but not in others.
Chit funds and Nidhis are financial institutions that are regulated by the Reserve Bank of India, and FDI is not allowed in these institutions.