What is sleep apnea? (2 points)
A. a condition in which an individual stops breathing while asleep, causing a measurable increase in blood oxygen levels
B. a condition in which an individual breathes more frequently while asleep, causing an increase in blood oxygen levels
C. a condition in which an individual stops breathing while asleep, causing a measurable decrease in blood oxygen levels
D. a condition in which an individual breathes more frequently while asleep, causing an decrease in blood oxygen levels