How Did Chargaff's Rules Contribute to Watson and Crick's Elucidation

Multiple Choice

How did Chargaff's rules contribute to Watson and Crick's elucidation of the structure of DNA?

A) The rules suggested an equal concentration of sugars and phosphates.
B) The rules suggested the amounts of all four bases were equal.
C) The rules suggested the base-pairing combinations of adenine with thymine and guanine with cytosine.
D) The rules suggested that each base corresponds to an amino acid.