**Core Concept**
Gestational hypertension is a pregnancy-related condition characterized by the development of high blood pressure after 20 weeks of gestation. It is a major risk factor for maternal and fetal morbidity. The underlying pathophysiology involves vascular endothelial dysfunction, increased vascular resistance, and alterations in the renin-angiotensin-aldosterone system.

**Why the Correct Answer is Right**
The correct answer includes factors that are associated with an increased risk of developing gestational hypertension. These factors are thought to contribute to endothelial dysfunction, increased vascular resistance, and alterations in the renin-angiotensin-aldosterone system. For example, a history of hypertension in a previous pregnancy is a significant risk factor, as it suggests underlying vascular endothelial dysfunction.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because a history of preeclampsia in a previous pregnancy is actually a high-risk factor for gestational hypertension. Preeclampsia is a condition characterized by new-onset hypertension and proteinuria after 20 weeks of gestation.

**Option B:** This option is incorrect because a family history of hypertension is a risk factor for developing hypertension, but it is not a high-risk factor specifically for gestational hypertension.

**Option C:** This option is incorrect because a history of chronic hypertension is a risk factor for gestational hypertension, as it suggests underlying vascular endothelial dysfunction.

**Option D:** This option is incorrect because a history of multiple gestations is a risk factor for gestational hypertension, as it is associated with increased placental mass and vascular endothelial dysfunction.

**Clinical Pearl / High-Yield Fact**
A history of preeclampsia in a previous pregnancy is a significant risk factor for gestational hypertension, and women with a history of preeclampsia should be closely monitored for signs of hypertension and proteinuria during subsequent pregnancies.

**Correct Answer:** A. A family history of hypertension is not a high-risk factor specifically for gestational hypertension.