IBPS Clerk Prelims 2017 Paper

(b) Replace 'whom' with 'who', Whom should be used torefer to the object of a verb or preposition. When indoubt, try this simple trick: If you can replace theword with "he"' or "'she," use who. If you canreplace it with "him" or "her," use whom.Ex - Who should be used to refer to the subject ofa sentence.
Ex - Whom should be used to refer to the object ofa verb or preposition.