75.
A:
The formation of elements of recognizable secondary structure (helices, sheets, turns etc.)
B:
The collapse of the extended polypeptide chain to form a more compact state in which the polar side chains are largely burried away from the solvent
C:
The formation of the distinct long range interactions which characterize the native tertiary structure and are a pre-requisite for the formation of specific binding and the catalytic sites.
D:
The association between the submits in the oligomeric proteins
The answer is: B
