Dark Nebulae Have Temperatures Around 10 K and Emit Mostly

Dark nebulae have temperatures around 10 K and emit mostly in the millimeter range. Are these values consistent with blackbody radiation?

A) Wien's law predicts a peak wavelength of a few millimeters, so this emission is consistent with blackbody radiation.
B) Wien's law predicts a peak wavelength of a few meters, so this emission is not consistent with blackbody radiation.
C) Wien's law predicts a peak wavelength of less than 1 mm, so this millimeter radiation must come from specific molecular sources.
D) Wien's law predicts a peak wavelength in the x-ray range, so this emission is not consistent with blackbody radiation.

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