In Studies on Human Fetuses, Habituation Was Demonstrated as Early

In studies on human fetuses, habituation was demonstrated as early as 30 weeks. When scientists studied fetuses at 38 weeks, they noticed a change in habituation. Which of the following statements best summarizes the change they noticed in the older fetuses?

A) Older fetuses were less likely to demonstrate habituation to a repeated stimulus.
B) Older fetuses were unable to habituate at all to a repeated stimulus.
C) Older fetuses demonstrated sensitization instead of habituation.
D) Older fetuses displayed habituation for a longer period of time than 30-week-old fetuses.