Question

1. Matter that falls into a black hole can form an external accretion disk heated by friction, forming some of the brightest objects in the universe. 2. If there are other stars orbiting a black hole, their orbits can be use to determine the black hole's mass and location. 3. Such observations can be used to exclude possible alternatives such as neutron stars.

A Only 1
B Only 1 and 2
C Only 1 and 3
D Only 2 and 3
E All 1, 2 and 3
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