Answer and explanation

Correct answer: A. which

  1. Step 1: A non-restrictive relative clause referring to a whole clause begins with 'which'.
Answer
which.
Why not the others: "that" is wrong because 'that' cannot introduce a non-restrictive clause after a comma. "it" is wrong because 'it' would create a comma splice. "what" is wrong because 'what' cannot refer back to the whole previous clause.

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