Based upon what you have learned about the position of the earth, sun, and moon during a lunar eclipse, during which phase of the moon can a lunar eclipse occur? a. new moon b. first quarter c. waxing gibbous d. full moon

The correct answer is D. Full Moon

An eclipse of the Moon (or lunar eclipse) can only occur at Full Moon, and only if the Moon passes through some portion of Earth's shadow.

A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the sun, Earth, and moon are aligned (in "syzygy") exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can occur only the night of a full moon.