The Miller-Urey "Experiment" Consisted Of

The Miller-Urey "experiment" consisted of:

A) sending a coded message via radio toward nearby stars that are similar to the Sun and may have planets.
B) attaching a metal plaque to the Voyager spacecraft to tell extraterrestrial beings about us, should the spacecraft ever be recovered.
C) monitoring tens of millions of radio frequencies at once in an effort to detect extraterrestrial radio communications.
D) passing an electrical arc through a mixture of hydrogen, ammonia, methane, and water and looking for resulting organic compounds.