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.

In the following question, three sentences are given, revolving around the same theme or idea. Decide which of the sentences are grammatically and meaningfully correct and mark the question accordingly.
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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