Astronomers Studying Stellar Evolution Draw a Curve on a Hertzsprung-Russell

Astronomers studying stellar evolution draw a curve on a Hertzsprung-Russell diagram called a "birth line". What does the birth line represent?

A) evolutionary track of a 1-solar-mass star (i.e., the Sun)
B) coordinates of the initial collapse of dense cores of various initial masses
C) coordinates of the transformation of protostars of various masses into pre-main-sequence stars
D) coordinates of the transformation of pre-main-sequence stars of various masses into main-sequence stars

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