The motion which causes the Moon to show phases when viewed from planet Earth is: D. Revolution of the Moon around Earth.
A moon can be defined as a round astronomical or celestial object that acts as the natural satellite of planet Earth, which is mainly visible at night due to the reflected light from Sun.
Based on astronomical evidences, the Moon travels around planet Earth in slightly elliptical orbits at a mean distance of 384,393 kilometers (238,857 miles).
In conclusion, the revolution of the Moon around Earth causes the Moon to show phases or changes in its appearance when viewed from planet Earth.
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