There Is a Short in the Light in Holden's Office

Multiple Choice

There is a short in the light in Holden's office, so it makes a soft but constant high-pitched sound. Maintenance workers have not been able to fix the problem. When Travis walks into Holden's office, he says, "How can you stand that awful noise?" Holden spends a moment listening, then says, "I don't even hear it anymore." Holden has been exposed to the sound so long that he has experienced

A) an absolute threshold.
B) sensory adaptation.
C) a difference threshold.
D) synasthesia.