Question

Which of the following is involved in every eclipse?

Shadows

The moon

The planets

Comets

Please answer ASAP!

Answer 1

Definitely not D. Comets, and not B. The moon, because there are solar eclipses as well, not only lunar. The planets don't really have anything to do with eclipses.
I think A. Shadows is the best answer. 

Answer 2

The answer is the planets.