When She Walks into Her Mother's Kitchen,Amelia Doesn't Know How

Multiple Choice

When she walks into her mother's kitchen,Amelia doesn't know how long she will be able to stay in the room because of the overpowering smell of onions.But when her sister comes home an hour later and complains about the smell,Amelia realizes that she no longer smells the onions at all.This is an example of

A) sensory adaptation.
B) just noticeable difference.
C) psychophysics.
D) a false alarm.