Part B has an error. The relative pronoun 'whom' should be replaced with 'who'.
'Whom' is used to refer to the object of a sentence. In the given sentence, 'police personnel' is the subject of the sentence. Therefore, we should use the relative pronoun 'who' which is used to refer to the subject of a sentence.
Hence, option (c) is the correct answer.
The correct sentence is: He said police personnel who were supposed to manage the crowd were nowhere to be seen.
Note:
Relative pronouns: A relative pronoun is used to connect a clause or phrase to a noun or pronoun. The clause modifies, or describes, the noun. The most common relative pronouns are who, whom, whose, which, and that. For example: She is the girl who received the award for bravery from our Home Minister.
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