An Intensive Care Unit Nurse Does Not Notice the Noise

An intensive care unit nurse does not notice the noise within the environment. However, the client's family member states, "How can you stand it in here? The lights, sounds, and activity would drive me crazy and I couldn't take it." The nurse has adapted to the:

A) intensive care unit work.
B) intensive care unit environment.
C) threatening stimuli.
D) nursing career.