Which of the following statements is not true?
A. Dust in dark clouds scatters visible light, making them opaque at visible wavelengths.
B. Since dust does not scatter light at sufficiently longer infrared wavelengths, dark clouds are transparent at these wavelengths.
C. Atomic hydrogen and a variety of molecules in dark clouds emit radio light, making them bright at radio wavelengths.
D. Dark clouds that are not collapsing are supported against collapse by a combination of thermal pressure, rotation, and magnetic fields.
E. Dark clouds that are collapsing ultimately form a single system, most likely either a single star or a binary star system.