Over What Typical Time Scale Will the Particular Pattern of Stars

Over what typical time scale will the particular pattern of stars in a specific constellation appear to change, as viewed from Earth, because of celestial motions?

A) a human lifetime, because of motions of individual stars
B) millions of years because stars move very slowly with respect to each other
C) a few hours because of Earth's rotation
D) a year because of Earth's orbital motion

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