Telescopes Designed to Observe Infrared Radiation

Telescopes designed to observe infrared radiation:

A) must be placed in orbit above Earth's atmosphere.
B) can be placed on Earth's surface as long as the altitude is high enough to avoid water vapor, the prime absorber of infrared in the atmosphere.
C) can be placed on Earth's surface as long as the altitude is high enough to avoid carbon dioxide, the prime absorber of infrared in the atmosphere.
D) can be placed at any convenient location on Earth's surface because infrared radiation penetrates one of the "windows" of transparency in the atmosphere.