It: It was this car that she had mentioned before she died

Dear teachers,

What sentences are correct?

  1. It was this car that she had mentioned before she died.
  2. It was this car which she had mentioned before she died.
  3. It was this car she had mentioned before she died.

Is there a rule?

I think all are correct. How about you?

Quoc

Hi,

I agree.

Alan