Which Is the Correct Breakdown and Translation of the Term

Which is the correct breakdown and translation of the term hypopnea?

A) hypo (fast) + pnea (breathing) = fast or rapid breathing
B) hypo (good) + pnea (breathing) = good breathing
C) hypo (over) + pnea (breathing) = heavy breathing
D) Hypo (over) + pnea (breathing) = heavy breathing
E) hypo (under) + pnea (breathing) = shallow breathing