In 1953, Stanley Miller and Harold Urey built a model of Earth's early atmosphere by mixing gases that were thought to have been there. They exposed the gases to an electric current to simulate lightning. The liquid that condensed during the experiment contained amino acids.

What was the significance of their results?
A.
Miller and Urey showed that all life evolved from a single common ancestor.
B.
Miller and Urey showed that lightning was necessary for life to form on Earth.
C.
Miller and Urey showed that inorganic compounds could combine to form the building blocks of living cells.
D.
Miller and Urey showed that spontaneous generation was possible.