When Max's Father Installed a New Ceiling Fan in His

Multiple Choice

When Max's father installed a new ceiling fan in his room, the "whirring" sound initially disturbed Max's sleep. After a few nights, however, Max was back to sleeping normally, as if the fan did not bother him at all. Max's filtering out of the fan's noise is best described as ____.

A) ​attention
B) ​habituation
C) ​mental hardware
D) ​mental software