The correct option is A Pauling and Corey
Linear chains of amino acids fold into stable geometries giving rise to secondary structures of proteins. α-helix and β-sheets the most important secondary structures in proteins. Pauling and Corey discovered these two common elements of secondary structure (present in over 60% of known proteins), before the first crystal structure of a protein was determined. For this and other work in chemical bonding, Linus Pauling received the Nobel Prize in Chemistry in 1954.