RBI Assistant Prelims 26 Mar 2022 Shift 2 Paper

In the following sentence, four words or phrases have been printed in bold. One bold part in the sentence is not acceptable in Standard English. Pick up that part and mark its number. If there are no errors in the bold parts, mark (5) i.e. No error as the answer.
The striktest/(A) lockdown declared last year caused untold misery/(B) to the livelihoods of a large number/(C) of workers, particularly in unorganized sectors./(D)