Question

How do scientists think the moon was formed?

A. It was once a planet that came too close to Earth's orbit around the sun.
B. The Earth's gravity captured a large asteroid.
C. A large object struck the Earth breaking off the moon.
D. It formed with the Earth when the Solar System was young.

Answer 1

C. Many scientists believe that the Moon is a huge chunk of Earth. They think that back when Earth was just forming, a Mars-sized meteor smashed into it. The crack-up hurled material out into space, and that material became the Moon.Somehow it got sucked into Earth’s gravitational field

Answer 2

C. A large object struck the Earth breaking off the moon.

http://www.psi.edu/projects/moon/moon.html