A Molecular Clock Is Best Defined as

A molecular clock is best defined as

A) the information contained in DNA or protein sequences that shows changes over time.
B) genes that under selective pressure show a higher rate in mutation frequencies.
C) organisms in favorable environments that have greater offspring potential.
D) the time between Earth's formation and the beginnings of life in an RNA world.
E) a monophyletic group of organisms that replicate in synchrony.