Explanation:

- Let’s go through the options:

- Option 1: Sunderbans

- Famous for mangroves and Royal Bengal tigers, but it's not primarily a marine sanctuary.

- Option 2: Chilka Lake

- Known for its lagoon ecosystem, birds, and dolphins, but it's a brackish water lake not a marine sanctuary.

- Option 3: Gulf of Kachchh

- ?? The first marine sanctuary in India. It features coral reefs, mollusca, dolphins, tortoises, and various sea birds. Declared in 1980 in Gujarat, it protects a unique marine ecosystem.

- Option 4: Lakshadweep

- Famous for coral reefs and marine life, but not the first recognized marine sanctuary.

Correct answer: Option 3 — Gulf of Kachchh ??