A is the answer to this question. The equator of the earth is actually an imaginary line. If you would view the earth from a distance, you will not see an actual line that will separate the north and south poles from each other. This usually signifies the middle of the celestial body.
The countries that are located near the equator of the earth may experience constant climate all year round but there are two usual periods that may occur namely wet and dry season. The wet and dry season can be different from one country to another. Most of the countries on the equator experience high and tropical climates all-year round.