Aron is asleep. his breathing has become more regular and he is less sensitive to external stimulation. the researcher can confirm that aaron is in stage 2 sleep by looking for on aaron’s eegs.

K-complex

Explanation:

According to my research on EEG charts, I can say that based on the information provided within the question the researcher should be looking for a K-complex on Aaron's EEG's. This is the largest waveform in an EEG and occurs during stage 2 of NREM sleep. According to researchers this is when the brain evaluates not to signal danger and is also aiding sleep-based memory consolidation.

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answer; (d) none of the above;

the answer is a wheel