Molecular Cloud Complexes Are

Molecular cloud complexes are:

A) molecular clouds that have a high percentage of more complex molecules.
B) many molecular clouds close to each other, spanning regions as large as 50 parsecs.
C) molecular clouds that show a more complex, web-like structure.
D) molecular clouds that radiate more ultraviolet than radio energy.
E) molecular clouds at much higher density, as high as 1022 molecules/m3.