Which Observation(s)and/or Experiment(s)demonstrate Ways That the Chemical Building Blocks of Life

Multiple Choice

Which observation(s) and/or experiment(s) demonstrate ways that the chemical building blocks of life (amino acids and DNA bases) could have originated on the early Earth?

A) Amino acids and DNA bases form from simple chemical reactions in experiments simulating the early Earth atmosphere.
B) Experiments have shown that naturally occurring clays can catalyze the formation of RNA strands.
C) These complex molecules have been found within meteorites.
D) All of the above