The Statement That Indicates the Mother of an 8-Month-Old Understands

The statement that indicates the mother of an 8-month-old understands infant sleep patterns is:

A) "I put the baby in my bed until she falls asleep, then I put her in her crib. "
B) "I let the baby skip an afternoon nap so she will fall asleep earlier. "
C) "I put the pacifier in the crib so she can find it when she wakes up. "
D) "I rock the baby back to sleep if she wakes up at night. "