Use Braces to Write the Members of the Set, or State

Use braces to write the members of the set, or state that the set has no members.
-The letters needed to spell the following words: tear, rate, rat, tea

A) {a, e, r, t}
B) {tear, rate, rat, tea}
C) {t, e, a, r, r, a, t, e, r, a, t, t, e, a}
D) {r, a, t}