Which of the Following Is an Important Part of the Reason

Multiple Choice

Which of the following is an important part of the reason it is hotter in summer in North America than in winter?

A) the Earth is closer to the Sun in summer
B) the Sun's rays hit the Earth more directly in the Summer, and spread out less
C) the cloud cover over the entire surface of the Earth is much less in summer
D) the nights are much longer in summer, allowing temperatures to stabilize
E) we see the full Sun in summer, instead of one of its partial phases