Question

during which phase of the moon does a lunar eclipse occur?
full moon
third quarter
waxing gibbous
waning crescent

Explanation:

A lunar eclipse happens when Earth passes between the Sun and the Moon, casting its shadow on the Moon. This alignment only occurs when the Moon is fully illuminated from Earth's view, which is the full moon phase. The other listed phases do not position the Moon, Earth, and Sun in the straight line required for a lunar eclipse.

Answer:

full moon