निम्नलिखित बहुलकों में से कौन-सा जैवनिम्नीय है?

Options

A. `(-CH_(2) - underset(Cl)underset(|)(C) = CH - CH_(2)-)_(n)`
B. `(-CH_(2) - CH = CH - CH_(2) - CH_(2) -overset(CN)overset(|)(CH)-)_(n)`
C. `(-O-underset(CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C) - O-underset(CH_(3)CH_(2))underset(|)(CH) - CH_(3) - underset(O)underset(||)(C)-)_(n)`
D. `(-overset(H)overset(|)(N) - (CH_(2))_(6) - overset(H)overset(|)(N) - overset(O)overset(||)(C) -(CH_(2))_(4) - overset(O)overset(||)(C)-)_(n)`