Confused between each of whom and both of whom. Please explain


Q.Neither my mother nor my father, both of whom are English professors, agree
with my contention that James Joyce's novel Ulysses is overrated

A. Both of whom are English professors, agree with my contention that
James Joyce's novel Ulysses is overrated.
B. Both of whom are English professors, agrees with my contention that
James Joyce's novel Ulysses is overrated.
C. Both of whom are English professors, agree with my contention that
Ulysses, a novel by James Joyce is overrated.
D. Each of whom is an English professor, agree with my contention that
James Joyce's novel Ulysses is overrated.
E. English professors the both of them agrees with my contention that
James Joyce's novel Ulysses is overrated.

OA B