The fire alarm has gone off so many times in their new school that Susannah and Tia don’t even flinch when they hear it.

In fact, they even remained in the school library during a fire drill because they assumed it was another malfunction. Their failure to respond like they once did to the fire alarm shows the process of

a. acquisition.

b. discrimination.

c. accommodation.

d. extinction.

e. assimilation.