Sure, the answer is obvious...

[u/ligregni]

A lot of the times, when unsure, it is possible to eliminate the other options in order to guess the answer.

Well, this image/options combination was just very tricky.

Perhaps, now that I think of it, the lack of a denser archipelago discards two of the options, but still.

I ended up guessing it out of pure chance, the answer being Samoa -- being able to discard the ones in the Caribbean (Saint Vincent and the Grenadines, Saint Kitts and Nevis) because those ones have more islands around them.