Why Is It Warmer in the Northern Hemisphere in July

Why is it warmer in the northern hemisphere in July than it is in December?

A) Earth is closer to the sun in the summer than it is in the winter.
B) The sun's rays shine more directly on the northern hemisphere in the summer than in the winter.
C) There are more greenhouse gases, such as carbon dioxide, in the atmosphere in the summer than in the winter.
D) The sun's energy output is greater in the summer than it is in the winter.
E) The size and shape of Earth's elliptical orbit changes from nearly circular in the summer to highly elliptical in the winter.