Multiple Choice Question:

Which of the following sentences contains an appositive?

A. As sleep progresses, reactivity and awareness decrease.
B. Interestingly, it is also characterized by a sudden and dramatic loss of muscle tone—effectively paralysis.
C. Leucippus, the first "atomist," described sleep as something that happened to the body when "the excretion of fine-textured atoms exceeds the accretion of psychic warmth."
D. When overcome by drowsiness but still awake, brain waves become slower, increase in height (amplitude), and become more synchronous (alpha waves).