Answer is: D. it is always wet.
Tropical rainforests are rainforests that occur in areas of tropical rainforest climate, between 10 degrees north and south of the equator.
In tropical rainforest there is no dry season, all months have an average precipitation of at least 60 mm.
Tropical rainforests contain a lot animal species.
They have high levels of biodiversity, around 40% to 75% of all biotic species are in the rainforest.