India’s first atomic power station was set up at

Surat (Gujarat)
Tarapur (Maharashtra)
Solapur (Maharashtra)
Trombay (Maharashtra)

The correct answer is D. Trombay (Maharashtra).

India’s first atomic power station was set up at Trombay, now known as Bhabha Atomic Research Centre (BARC), in Mumbai, Maharashtra. It was commissioned in 1956 and had a capacity of 40 megawatts. The station was built with the help of the United States and Canada.

The other options are incorrect. Surat is a city in Gujarat, Tarapur is a city in Maharashtra, and Solapur is a city in Maharashtra.