Rosetta Sets Her Alarm Clock to "Medium Loud" at the Start

Multiple Choice

Rosetta sets her alarm clock to "medium loud" at the start of the semester. The first few times it rings, she hears it and jumps out of bed immediately. By the second week of classes, Rosetta sleeps right through the alarm until she resets it to "really loud." What is this an example of?

A) shaping
B) successive approximations
C) secondary reinforcement
D) habituation