After Reading the Paragraph Below, Answer the Question That Follows

Multiple Choice

After reading the paragraph below, answer the question that follows.
You are sitting in lecture trying to pay close attention to every word that your professor speaks. You understand that she is exceptionally intelligent and, after this course, you may never have another opportunity to hear her speak. Maddeningly, the person sitting beside you is biting their fingernails and the constant click-clicking noise is distracting you. Eventually though, you stop noticing and find that you can concentrate. Then, the person begins to crack their knuckles.
-What type of learning response was at play when you stopped noticing the initial behaviour of fingernail biting?

A) imprinting
B) accommodation
C) association
D) habituation