Which factor is key to the earth having seasons?

A.

how close earth is to the sun

B.

the angle between sunlight and the earth's surface

C.

the pull of the moon on the earth

D.

the speed of rotation of earth on its axis

1. the earth spining on its axis.

a. 92.96 million mi

b. When the sun's rays strike Earth's surface near the equator, the incoming solar radiation is more direct (nearly perpendicular or closer to a 90˚ angle). Therefore, the solar radiation is concentrated over a smaller surface area, causing warmer temperatures.

c. The moon's gravitational pull on the Earth is the main cause of the rise and fall of ocean tides. The moon's gravitational pull causes two bulges of water on the Earth's oceans-one where ocean waters face the moon and the pull is strongest and one where ocean waters face away from the moon and the pull is weakest.

d. about 1,000 miles per hour (1,600kph)

I am thinking it is d i not sure tell me if i am wrong