The Phrase "Diurnal Motion" Refers to the

The phrase "diurnal motion" refers to the

A) slow change in position of the constellations from east to west from night to night, resulting in different constellations being visible at 11 P.M. in May than at 11 P.M. in December.
B) change in position of the Moon in the sky as it runs through its phases over the course of 1 month.
C) apparent motion of the Sun along the ecliptic over the course of 1 year.
D) gradual motion of the constellations from east to west across the sky each night, resulting in different constellations being visible at 4 A.M. than at 10 P.M. on any given night.