According to the current theory, the Earth's moon was formed __________. a. together with Earth c. from a portion of Earth b. separately from Earth d. from a leftover star

Well, the current theory says that another planet hit the Earth early in the time when Earth was formed and the debris from this hit later formed the moon: so the best answer from the options is " c. from a portion of Earth" but even better option would be "from another planet that hit the Earth"