Suppose We Observe a Source of X-Rays That Varies Substantially

Suppose we observe a source of X-rays that varies substantially in brightness over a period of a few days.What can we conclude?

A) The X-ray source is a quasar.
B) The X-ray source contains a black hole with an accretion disk.
C) The X-ray source is no more than a few light-days in diameter.
D) The X-ray source must have a strong,rapidly varying magnetic field.
E) We are seeing the rapid orbit of two stars in a binary system.

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