The correct choice is (c) DH
For explanation: When protease is used to depolymerize the protein, the extent of hydrolysis (degree of hydrolysis) is described in DH units and is given by
DH=\(\frac{Number \,of \,peptide \,bond \,cleaved}{Initial \,number \,of \,peptide \,bonds \,present}\)
Commercially, using enzymes such as subtilisin, DH values of up to 30 are produced using protein preparations of 8-12% (w/w).