Which statement best explains why stars viewed from the northern hemisphere appear to revolve around polaris?

The answer is Option 2: Earth rotates on its axis.

Explanation:

Polaris is also more commonly know as the North Star is a triple star system and it appears to us here on Earth as the brightest star in the Ursa Minor constellation.  Because the North Star is almost directly in line with the rotational axis of the earth, which is the North Pole, the star appears to stand still in the sky while the other stars in the northern hemisphere seem to rotate around Polaris. It has been used by navigators to help guide them to their destinations when there was no other landmarks to gain a sense of cardinal direction.

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.