Which of the Following Propositions Uses Punctuation to Indicate Whether

Which of the following propositions uses punctuation to indicate whether a relative clause is restrictive or nonrestrictive?

A) The fear of cannibals, who are quite rare today, still haunts many people.
B) Acid rain contains carbonic acid (H₂CO₃) .
C) The Great Depression affected economies in North America, Europe, and beyond.
D) Economics, finance, business administration, and accounting are all majors in the university's College of Business.
E) The Klingons are winning, but the battle is not yet lost.