Direction: Spot the grammatical errors in the given sentence. Mark the part with error as your answer. If there is no error, mark "No error" as the answer. (Ignore punctuation error)

Illegal sand mining has become (a)/ a boom business fuelled (b)/ by the ever-increasing demand (c)/ of the industry, (d)/ No construction error (e)

[BANK OF BARODA (PO), 2011]