A comet is best known for its visible tail that can even be seen with the naked eye as comets, like Halley’s Comet has a tail at some points during its orbit, but not at other points?

A. As the comet nears the sun, the temperature rises, which causes the tail to appear.

B. As the comet nears the sun, the temperature falls, which causes the tail to appear.

C. As the comet moves away from the sun, the temperature rises, which causes the tail to appear.

D. As the comet moves away from the sun, the temperature falls, which causes the tail to appear.