The university board decided to postpone the commencement ceremony, ______ disappointed many graduating students and their families.

Answer and explanation

Correct answer: C. which

  1. Step 1: Analyze sentential relative clause: The relative clause refers back to the entire preceding proposition ('The board decided to postpone...').
  2. Step 2: A non-restrictive relative clause modifying a whole clause requires the relative pronoun 'which' preceded by a comma.
Answer
which.
Why not the others: 'that' cannot be used after a comma in non-restrictive clauses; 'what' cannot act as a relative pronoun with an explicit antecedent clause; 'whom' refers only to human direct objects.

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