Which of these fall within the typical range of dimensions of a giant molecular cloud in interstellar space?
A) mass of about 1000 solar masses in volume with a diameter of about 1000 ly
B) mass of about 1 million solar masses in volume with a diameter of about 100 ly
C) mass of about 1 million solar masses in volume with a diameter of about 100 au, about the size of the solar system
D) mass of about 1000 solar masses in volume with a diameter of about 100 ly
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