What is the relationship between the mass of a protostar and the time needed for it to reach the main sequence after it forms inside an interstellar cloud?
A) More massive protostars reach the main sequence in a shorter time than less massive protostars.
B) Less massive protostars reach the main sequence in a shorter time than more massive protostars.
C) The time needed is independent of the mass of the protostar.
D) The time needed is least for a protostar of approximately 4 solar masses and longer for protostars of either greater or lesser mass.
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