What are the typical dimensions of a giant molecular cloud in interstellar space?

Question

Quizplus · Accepted Answer

Giant molecular clouds typically have masses of about 1 million solar masses and diameters of about 100 ly. This is based on observations of known giant molecular clouds in our own Milky Way Galaxy. Option A is incorrect as the diameter is too large for that mass, while option C is incorrect as the diameter is too small for that mass. Option D has the correct mass, but the diameter is too small for a giant molecular cloud.

What Are the Typical Dimensions of a Giant Molecular Cloud