Read each sentence to find out whether there is any grammatical error in it. The error if any will be in one part of the sentence, the letter of that part will be the answer. If there is No error, the answer is ( e ).i.e. 'No error'. (Ignore the errors of punctuation, if any.)
A cash prize was (a)/ award to the most (b)/ successful salesman of the year (c)/ by the President of the company. (d)/ No error (e)

Answer

b

Explanation

Look at the structure of the sentence in Passive Voice of Past Simple.
Subject + was/were + `V_(3)` (Past Participle)
Hence, awarded to the most … should be used.