We can actually deduce here that in "Black Hole Beginnings," what is described as the cause of gas and dust forming into a star is B. Gravity.
What is cause?
Cause actually refers to something that leads to the outcome or result of something else. In other words, something that actually leads to the occurrence of something else is known to be the cause of that thing.
Whenever something happens or takes place, there seems to be something else that causes it to take place.
Thus, we see here that in "Black Hole Beginnings," gravity is actually described as the cause of gas and dust forming into a star.
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