Claudia, a Preschooler, Resists Going to Bed Every Night and Usually

Claudia, a preschooler, resists going to bed every night and usually wakes up a few times at night. Which of the following should her parents do to ensure that she is able to get a sound sleep?

A) They should make her eat a heavy meal just before bedtime.
B) They should switch off all the lights in her room when putting her to bed.
C) They should allow her to watch her favorite cartoon just before bedtime.
D) They should allow her to sleep with her favorite doll and her favorite blanket.