哪个戏曲最难演唱的难度?

A. aria from "The Merry Widow" B. aria from "The Barber of Seville" C. aria from "Carmen" D. aria from "The Phantom of the Opera"

aria from "The Merry Widow" is considered one of the most difficult arias to sing due to its complex vocal requirements, including high notes, complex ornamentation, and a wide range of emotions.