Which of the following is not a correlative conjunction?

a neither ...

nor

b whether ...

or

c both ...

yet

d all of the above

e none of the above

Correlative conjunctions are conjunctions that are used to connect equal or balanced clauses. These include neither/nor, either/or, both/and, not ... only, but ... also and whether/or. From the given conjunctions above, the choice that is not a correlative conjunction is option c. both ... yet. The pair of both should not be "yet" but "and".