Which of the following is a known risk factor for hypertensive disorders in pregnancy?

Multiple gestation is indeed recognized as a known risk factor for hypertensive disorders in pregnancy. Women carrying twins, triplets, or more are at a significantly higher risk for developing conditions such as gestational hypertension and preeclampsia. The increased demand on the body during a multiple pregnancy contributes to this heightened risk, as the presence of multiple placentas can lead to increased vascular resistance and higher levels of circulating pregnancy-related hormones. This physiological change can strain the mother's body and lead to complications related to blood pressure regulation.

In contrast, other factors such as being under 25 years of age, having a low body mass index, or a history of regular menstruation are not typically associated with an increased risk for developing hypertensive disorders. In fact, younger women and those within a healthy weight range often show lower risk profiles for these complications compared to older women or those with obesity. Thus, the association of multiple gestation with increased risks for hypertensive disorders stands out clearly within the context of pregnancy.