Correct option is D
The correct option is (d) No improvement.
Explanation: "As well as" does not change the subject-verb agreement, so the singular verb "was" is correct because the subject "Suraj" is singular.
Grammatical Rule used: When "as well as" is used, the verb agrees with the main subject of the sentence, which in this case is "Suraj" (singular).
Corrected sentence: Suraj, as well as his friends, was arrested.