Which of the Following Sentences Contains a Restrictive Clause

Which of the following sentences contains a restrictive clause?

A) The actors on Friends, who were well paid, have now moved on to other projects.
B) It is important to plant and to harvest at the right times of year.
C) Soccer is called "football" in many countries.
D) Many bacterial diseases, which can be cured, still claim many lives each year.
E) The woman whom we saw on the elevator is my second cousin.