Sally, a 7-Month-Old Infant, Is Shown a Toy She Has

Sally, a 7-month-old infant, is shown a toy she has not seen previously. As the toy continues to be presented, which is LEAST likely to occur?

A) Sally will stare at the toy less and less.
B) Sally will suck less on her pacifier when looking at the toy.
C) Sally will become habituated to the toy.
D) Sally's heart rate will remain stable when looking at the toy.