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Astronomers find the existence of black holes by finding 'companions stars' that seem to orbit around nothing.

What kind of information can astronomers learn by analyzing the period and radius of the companions star's motion?

I. Mass of the black hole.
II. Acceleration due to gravity near the black hole.
III. Escape velocity of the black hole.

A

I only.

B

II only.

C

I and II only.

D

II and III only.

E

I, II, and III.

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