Which states a reason why stage 3 is considered to be the deepest sleep stage?
A. A person in this stage is easily roused by meaningful stimuli.
B. A person who awakes from stage 1 is groggy and confused.
C. A person who awakes from this stage is alert and attentive.
D. Only very loud stimuli will awaken a person from stage 3 sleep.
Answer: D
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