The correct answer is option B
The equator is that region of earth that is warm throughout the year. The temperature there is not cool at anytime of the year.
The Tropical climate is hot and humid throughout the year. The earth receives direct sunlight on the equator side.
Seasons change due to change in the angle by which the sunlight falls on earth, that measures the amount of sunlight reaching the earth which decides the climate of the region but there is no tilt on the equator so the sunlight directly reaches the equator and as a result of this it is always warm.
