It Is Unlikely That We Will Be Able to Detect

Multiple Choice

It is unlikely that we will be able to detect the signals from civilizations in other galaxies because

A) signals from other galaxies will be severely weakened by distance, making them far harder for us to detect
B) other galaxies are unlikely to harbor intelligent civilizations
C) signals from civilizations on other galaxies will not reach us before we give up listening
D) they will most likely transmit at wavelengths that will be absorbed by intergalactic gas