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A star is thought to be born when

Aa protostar reaches a temperature high enough for nuclear fusion to begin.
Ba red giant collapses on itself and becomes a black hole.
Cpressure within a protostar becomes so great that a supernova occurs.
Dincreasing heat within a supergiant causes gravity to be greater than pressure.

Verified Answer :

a protostar reaches a temperature high enough for nuclear fusion to begin.

Answer:

a. a protostar reaches a temperature high enough for nuclear fusion to begin.

Explanation:

  • A protostar is a very young star that is gathering mass a form the stellar mass, supported by the pressure and ends with an inflating gas and the energy generated produces the stars that come from nuclear fusion occurs at the centre of the rotating disk.

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