Part D has an error. The relative pronoun 'which' should be replaced with 'who' to rectify the given sentence.
The relative pronoun 'which' is used to refer to inanimate objects. It cannot be used to refer to the noun 'customers'. The relative pronoun 'who' can be used to refer to the subject 'customers'.
Hence, option (a) is the correct answer.
The correct sentence is: These complaints caused much frustration and anger among the customers who will use the service.
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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