Which of the Following Statements About Fetal Activity and Inactivity

Which of the following statements about fetal activity and inactivity is true?

A) Fetuses do not have true sleep states, but they do have periods of inactivity while awake.
B) Fetuses have periods of high activity and rest while awake, and they have both active and quiet sleep states.
C) Fetuses are essentially asleep most of the day and night, but their sleep can be active or quiet.
D) Fetuses are in constant motion throughout the day and night.