Our Sense of Smell Shows Evidence of Sensory Adaptation

Our sense of smell shows evidence of sensory adaptation. The perceived strength of an odor usually ​

A) fades to less than half its original strength within about four minutes.
B) increases to more than twice its original strength within about four minutes.
C) fades to less than half its original strength within a few seconds.
D) slowly increases over time, reaching a maximum in about 15 minutes.