Chelsea is experiencing contractions that are 10 minutes apart and the amniotic sac just ruptured. What stage of labor is she in?

A) first
B) second
C) third
D) fourth

Chelsea is in the first stage of labor because her contractions are 10 minutes apart and the amniotic sac has just ruptured, which usually occurs during the early or active phase of the first stage of labor. The first stage of labor is characterized by the onset of contractions and cervical dilation and effacement, which can be divided into three phases: early, active, and transitional.