Which best describes the leading theory about earth moon formed?

The leading theory about the formation of Earth's Moon is the Giant Impact Hypothesis. This theory suggests that the Moon formed from the debris created when a Mars-sized body, often referred to as Theia, collided with the early Earth. The impact caused material to be ejected into orbit around Earth, which eventually coalesced to form the Moon. This hypothesis is supported by similarities in isotopic compositions of Earth and Moon rocks.