Answer: Un safari africano
Explanation: The question is something like:
Which thing is not in the Arenal lake?
and the options are:
Un safari Africano, which means "An African safari"
Un volcán activo, which means "An active volcano"
Un bosque de nubes, which means "A cloud forest"
The Arenal lake is in Costa Rica, so it's easy to see that there can't be an African safari, so the right answer would be "un safari African"
none the less, there is the "Bosque Nubloso Monteverde" and the "Volcan Arenal", so in the lake, you have a cloud forest and an active volcano.