Question

Which of the following means "she sleeps" in Spanish?

A.duermo
B.duermes
C.duerme
D.duermen

Answer 1

your answer is c if not d is a close second 

Answer 2

A. Duermo is the present "yo" form of dormir
B. Duermes is the present "tu" form of dormir
C. Duerme is the present "he/she" form of dormir
D. Duermen is the present "they" form of dormir

She sleeps would therefore be "Ella duerme." The correct answer is C, "duerme."