The Most Likely Region of the Radio Spectrum for Communication

Multiple Choice

The most likely region of the radio spectrum for communication with other civilizations is the water hole, the part of the spectrum

A) near the radio emission of water.
B) near the radio emission of oxygen molecules.
C) between the radio emissions of hydrogen and oxygen.
D) between the radio emissions of hydrogen and OH.
E) near the radio band where water in the Earth's atmosphere strongly absorbs energy.