In which sentence is the essential clause underlined?

(1 point)

A.) Eve's sister, who loves opera, took her to a performance. ( underlined words are "who loves opera")

B.) Eve, holding her program, waited for the curtain to go up. ( underlined words are "holding her program")

C.) The soprano, visiting from Canada, had long black hair. ( underlined words are "visiting from Canada")

D.) The person who sells souvenirs is in the lobby. ( underlined words are "who sells souvenirs")

The essential clause is underlined in sentence D: "The person who sells souvenirs is in the lobby." The clause "who sells souvenirs" provides essential information about the person being referred to.