Question

Select the sentence in which the verb correctly agrees with the subject. A. Les and Miranda is late for work today. B. A copy of Moby Dck and several magazines has disappeared from my room. C. Not only the muffler but also the spark plugs need to be replaced. D. Peggy and Phyllis drives me to Florida every winter.

Answer 1

Answer is C.

"Not only the muffler, but also the spark plugs need to be replaced"

There are 2 subjects, muffler and spark plugs, which make it a plural subject. 

verbs in plural forms have no -s in it

(e.g)

This apple tastes bad (singular)

These apples taste bad (plural)

so the verb "need" in the sentence is correct

Answer 2

Answer:

A. Not only the muffler but also the spark plugs need to be replaced

Explanation: