Why Was the Idea That Genes Are Made of Nucleic

Why was the idea that genes are made of nucleic acids NOT widely accepted until after 1950?

A) Proteins are more abundant than nucleic acids, so it seemed more logical that proteins would carry genetic information.
B) Until the structure of DNA was understood, how DNA could store and transmit genetic information was unclear.
C) Amino acids existed in the prebiotic environment, so they would have most likely been the first to carry genetic information for life.
D) DNA was not chemically stable for long enough to be a good method of storing genetic information.
E) Nothing was known about the chemistry of DNA until after 1950.