In this exercise you have to complete the blank with the correct option. In this case the correct option would be "selva tropical". We know that by context. The sentence in English says something more or less like this:
-The......................... of Peru is very hot, especially in summer.
So the missing word can't be "church", "Museum", or "Cathedral".
So the correct option would be:
La selva tropical del Perú es muy calurosa, sobre todo en verano.
They are said to be elves that live in mounds of Iceland.They are said to wear grey and had black hair. The hidden people are only spotted but some say it's just a legend