Why does the northern hemisphere experience seasons? *

a. earth is closer to the sun during one half of the year than it is during the other half of the year.

b. sunlight hits the northern hemisphere in varying amounts as earth rotates on its axis.

c. earth’s tilt causes the northern hemisphere to be heated in different amounts as earth revolves around the sun.

d. sunlight hits the northern hemisphere with equal intensity throughout the year, but earth revolves around the sun.