When Researchers Calibrate the Molecular Clock They Are

When researchers calibrate the molecular clock they are

A) determining how much time it takes to accumulate a certain percentage of nucleotide changes.
B) setting the geological time scale according to the position in which the fossil was found in the rock.
C) investigating where the least common ancestor was found.
D) generalizing about the amount of time between speciations.
E) setting the geological time scale according to the position in which the fossil was found in the rock . and investigating where the least common ancestor was found.