Why Did Scientists Originally Believe That Proteins,rather Than DNA,were the Molecules

Why did scientists originally believe that proteins,rather than DNA,were the molecules that directed protein synthesis?

A) Proteins were the more complex molecules in which genetic information could be stored.
B) Proteins were more likely to have catalytic properties for synthesis reactions.
C) Proteins were the same types of molecules as those that were being synthesized.
D) At the time,more was known about the structure of proteins than that of DNA.