How Did Spiegelman Et Al

Multiple Choice

How did Spiegelman et al.'s experiment on the origins of natural selection provide evidence for natural selection in an RNA-based world?

A) The RNA was originally 4,000 nucleotides; after several serial transfers it was reduced to 200 nucleotides as a result of faster replication of shorter sequences being advantageous.
B) The RNA sequence was originally 4,000 nucleotides; after several serial transfers it increased to 20,000 nucleotides as a result of faster replication of longer sequences being advantageous.
C) The experiment did not demonstrate natural selection.
D) The RNA remained at approximately is original sequence of 4,000 nucleotides, demonstrating fitness in a stable environment.