Read the sentence, and decide whether the underlined portion contains a mistake.

The attorney planned to settle the case out of court, which, to everyone involved in the tragedy, was a relief.

A. which was relieving to the tragedy involved.

B. which made the tragedy a relief to everyone.

C. which has made a feeling of relief come over everyone involved in the tragedy.

D. which was a relief to everyone involved in the tragedy.

E. No improvement or correction is required.