Which statement best explains why areas close to Earth's equator tend to be warmer than areas farther away from the equator?
A. The sun's radiation is spread over a larger area near the equator.
B. The sun's rays transfer less heat per square kilometer near the equator.
C. The sun's radiation is concentrated in a smaller area near the equator.
D. The sun's rays strike Earth's surface at an angle near the equator.​