The Earth rotates about an axis XY, as shown below.

P and Q are positions on the Earth’s surface that receive solar radiation from the Sun. Why is the intensity of the solar radiation incident at P significantly greater than the intensity at Q?

A. The same amount of solar power is spread over a larger surface area at P.

B. The path length through the Earth’s atmosphere of the solar radiation is shorter for P.

C. The distance travelled by the solar radiation to reach the top of the Earth’s atmosphere is shorter for P.

D. The periodic variations in the solar power radiated from the Sun’s surface have more effect at P.

B