Why Did William Herschel Have to Observe Uranus on More

Why did William Herschel have to observe Uranus on more than one night before he could be sure it was a planet and not a star?

A) He had to see if it showed a full range of phases from new to full
B) He had to see if it moved among the stars from night to night
C) He had to see if it had satellites
D) He had to see if it varied in brightness from night to night

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