How Large and Bright Is a Young Protostar of 1

How large and bright is a young protostar of 1 M ? , whose age is about 1000 years, compared to the radius R and luminosity L of the Sun?

A) 1 × R, the same size as the Sun, and 100 × L
B) 20 × R, 100 × L
C) 1 × R, 1 × L, because a protostar of this mass has already evolved to a Sun-like main-sequence star
D) 20 × R, but still much fainter than the Sun, at L/10

Correct Answer:

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