The less dense areas created as a sound wave propagates are called A. rarefactions✅
B. troughs
C. crests
D. compressions

C. crests

don't trust me though

The less dense areas created as a sound wave propagates are called rarefactions.

Explanation:

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dopamine..

"it was found that some people who were taking the drug l-dopa to raise their levels of dopamine were developing schizophrenic-like symptoms supporting research a strength of the dopamine hypothesis is that there are many studies which have shown support for the neurochemical explanation."

object 2 because all the other ones are wrong