I believe the answer is abhor.
The underlined pronoun can be identified a subject influence on the sentence....
Actually..... all of them are correct!
The difference is whether the word "the orchestra" needs a plural or singular verb. In American English a singular verb is needed (so American English would only accept options a) and c) ) but in British English both forms are acceptable: so in British English all four sentences are correct.
Answer:
C... the main purpose of a suffix is to show what part of speech the word is...eg. noun or adjective
