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When does a protostar become a true star?

A) when the star is 1 million years old
B) when the central temperature reaches 1 million Kelvin
C) when nuclear fusion begins in the core
D) when the thermal energy becomes trapped in the center
E) when the stellar winds and jets blow away the surrounding material

Marked as best answer by Twix

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C

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Please could you help me with another one. Thank you