Elephanta Island:
It is NOT located near the coast of Goa. It's actually located near Mumbai in Maharashtra, in the Arabian Sea. It's famous for the Elephanta Caves, a UNESCO World Heritage Site with ancient rock-cut temples dedicated to Lord Shiva. The original name of the island was Gharapuri, but Portuguese renamed it "Elephanta" after seeing a large stone elephant sculpture there.
Sriharikota:
Correctly located at the mouth of Pulicat Lake on the east coast of India in Andhra Pradesh.
It's India's primary spaceport, home to the Satish Dhawan Space Centre (SDSC).
ISRO launches most of its satellites from this location.
It's a barrier island that separates Pulicat Lake from the Bay of Bengal.
Pirotan Island:
Correctly located off the Kachchh coast in Gujarat.
It's part of the Marine National Park in the Gulf of Kachchh.
Known for its coral reefs and marine biodiversity.
It's the most accessible island in the Marine National Park and a popular destination for coral viewing.