B A
N
S
С C
D
Which point on the diagram best represents the positions of the Earth and the
Sun when it is summer in North America?
A
Point A
Point B
с
Point C
D
Point D

an angle + its complement = 90 degrees

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.