Which of the following is a sign that labor may be imminent?

The rupture of membranes, often referred to as "water breaking," is a clear and definitive sign that labor may be imminent. When the amniotic sac surrounding the fetus breaks, it can lead to the release of amniotic fluid. This event indicates that the body is preparing for labor, as it is often one of the first signs that labor is nearing, especially if the woman is at term.

In most cases, once the membranes rupture, labor typically follows within a short period, prompting a need for the pregnant person to head to the hospital or birthing center for delivery. Other signs, such as Braxton Hicks contractions, though they may occur frequently, do not indicate that labor is imminent; rather, they are practice contractions that help prepare the uterus.

Cessation of pregnancy symptoms or experiencing an increased appetite and energy levels are not reliable indicators of labor approaching. These symptoms can arise for various reasons during pregnancy but do not signify an imminent labor scenario. Thus, the rupture of membranes stands out as the most critical and telling sign.