In which of the following polymers ethylene gylcol is one of the monomer units?
A.
B. `(-CH_(2) - CH_(2) -)_(n)`
C.
D. `(-O - underset(CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C) - O - underset(CH_(2)CH_(3))underset(|)(CH) - CH_(2) - underset(O)underset(||)(C)-)_(n)`