Which of the following is a couplet?

a. “in the sepulcher by the sea,
in the tomb by the sounding sea.”

b. “of those who are older than we-
of many far wiser than we-”

c. “and so, all the night-tide, i lie down by the side
of my darling- my darling-my life and my bride,”

d. “in all my dreams, before my sight,
he plunges at me, guttering, choking, drowning”