Which of the Following Is True of Morning Sickness

Which of the following is true of morning sickness?

A) Morning sickness manifests itself only during the third trimester of a woman's pregnancy.
B) Morning sickness is defined as nausea that occurs only before noon in pregnant women.
C) Evidence links the incidence of morning sickness with a lower risk of miscarriage.
D) Over 90 percent of pregnant women experience morning sickness throughout their pregnancy.