What Is the Difference Between a Giant Molecular Cloud and an H

What is the difference between a giant molecular cloud and an H II region?

A) They are two names for the same thing.
B) The hydrogen in a giant molecular cloud is in molecular form. The hydrogen in an H II region is in ionized atomic form.
C) A giant molecular cloud is an H II region on a much larger scale.
D) A giant molecular cloud is a bright spot within an H II region.

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