Find out the error part of the following sentences : The disclosure of the synopsis of (1)/ the Thakkar Commission Report (2)/ on the assassination of Mrs. Gandhi (3)/ has raised several vital question (4)/ No error (5)

Explanation

Vital question की जगह vital questions का प्रयोग होगा। क्योंकि several के वाद हमेशा plural noun का प्रयोग होता है।