Explanation:

- Here’s the thing: India actually has 75 wetlands listed under the Ramsar Convention as of June 2024.

- Let’s break down the options:

- Option 1: 35 — That was true around 2019–2020. Since then, the number’s jumped.

- Option 2: 21 — This goes way back, about a decade ago.

- Option 3: 26 — This number was relevant somewhere between 2012–2016, but it's outdated now.

- Option 4: 39 — That’s also old data from around 2021.

- So, the correct answer isn’t even listed here, technically. But if you had to pick the most up-to-date option among these in recent years, it would have been higher than 39.

Let me emphasize: as of 2024, the real number is 75 wetlands under Ramsar in India. The data in your options are just not current.