**Core Concept**
Pregnancy-induced hypertension (PIH) is a critical condition characterized by new-onset hypertension after 20 weeks of gestation in a previously normotensive woman. PIH can lead to severe complications such as preeclampsia, eclampsia, and fetal growth restriction. The pathophysiology involves endothelial dysfunction, abnormal angiogenesis, and excessive production of anti-angiogenic factors.

**Why the Correct Answer is Right**
The patient's sudden increase in blood pressure, absence of proteinuria, and lack of symptoms suggestive of preeclampsia (such as headache or visual changes) are characteristic of gestational hypertension. This diagnosis is supported by the absence of proteinuria, which is a key distinguishing feature from preeclampsia. The patient's blood pressure readings are significantly elevated, but the lack of other symptoms and proteinuria makes preeclampsia less likely.

**Why Each Wrong Option is Incorrect**
**Option A:** Preeclampsia typically presents with proteinuria and hypertension, and symptoms such as headache, visual changes, or abdominal pain. This patient does not meet these criteria.
**Option B:** Chronic hypertension is defined as hypertension that is present before 20 weeks of gestation or persists beyond 12 weeks postpartum. This patient's baseline blood pressure was normal, and her hypertension developed during pregnancy.
**Option C:** Eclampsia is a severe complication of preeclampsia characterized by the onset of tonic-clonic seizures in a pregnant woman. This patient does not have symptoms suggestive of eclampsia.

**Clinical Pearl / High-Yield Fact**
Gestational hypertension is a significant risk factor for developing preeclampsia, which can lead to severe maternal and fetal complications. Close monitoring and timely delivery are essential in managing patients with gestational hypertension.

**Correct Answer:** C. Gestational hypertension.