During what what phase of the moon can a lunar eclipse occur?

A. New moon

B. First quarter

C. Waxing gibbous

D. Full moon

Answer: The correct option is D.

Explanation: Lunar eclipse occurs when Sun, Earth and Moon all align in the same line and the plane of Earth's and Moon's orbit around the Sun are same. The light of the sun is blocked by the Earth and hence, the Earth casts its shadow on Moon. The moon passes through the Earth's shadow and is eclipsed and appears dark.

This eclipse occurs only on the night of full moon.

Full moon occurs when Sun, Earth and Moon align in the same line but the plane of the Moon is slightly tilted with respect to Earth around the Sun.

Hence, the correct option is D.