Answer: D. It has warm temperatures throughout the year.
Explanation: Tropical climates are characterised by high temperatures (aka. warm/hot weather) as well as having rainfall. They are known for typically being located very close to the equator (as these areas receive the most sunlight throughout the year) and often do not have distinct seasons due to the increased sunshine which causes the warmer temperature (less likely to have cold weather such as in a typical winter or fall).
Example: Think of a rainforest these trend to have a tropical climates (the foliage act as shade on the ground level which protects against some of the harsh sunlight).