Choose the sentence in which the relative clauses are worded and punctuated correctly:

Answer and explanation

Correct answer: C. The grant, which the senate approved in May, funds two laboratories, both of which are located in Irbid.

  1. Step 1: A non-defining clause adds extra information, so it takes 'which' and a pair of commas around it.
  2. Step 2: 'Both of which' must agree with the plural 'laboratories' (are located); 'both of them which' is a double reference and 'that' cannot follow a comma.
Answer
The grant, which the senate approved in May, funds two laboratories, both of which are located in Irbid.
Why not the others: The other choices use 'that' after a comma, a singular 'is', a redundant 'them which', or misplaced commas.

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