**Core Concept**
The patient in question is presenting with symptoms suggestive of a mild form of preeclampsia, characterized by new-onset hypertension and proteinuria in a previously normotensive individual, in the context of a pregnancy. The presence of pitting edema without calf tenderness and the absence of significant proteinuria (trace proteinuria) and severe hypertension suggest a mild form of the condition.

**Why the Correct Answer is Right**
The management of mild preeclampsia typically involves close monitoring of the patient's blood pressure, proteinuria, and fetal well-being. Bed rest, dietary modifications, and monitoring for signs of progression to severe preeclampsia are essential components of management. The correct answer involves close observation and monitoring, without immediate intervention.

**Why Each Wrong Option is Incorrect**
**Option A:** Immediate delivery is not recommended for mild preeclampsia, as the risks of preterm birth and associated complications often outweigh the benefits.
**Option B:** Corticosteroids are used to promote fetal lung maturity in cases of preterm labor or delivery, but are not the primary management for mild preeclampsia.
**Option C:** Low-dose aspirin is used as a preventive measure for preeclampsia in high-risk patients, but is not the best management option for a patient with mild preeclampsia.
**Option D:** Methyldopa is an antihypertensive medication that may be used in pregnancy, but is not the best initial management option for mild preeclampsia.

**Clinical Pearl / High-Yield Fact**
In cases of mild preeclampsia, it's essential to differentiate between pitting edema (a common finding in normal pregnancy) and proteinuria, which is a key component of the preeclampsia diagnosis. A 24-hour urine protein collection may be necessary to confirm significant proteinuria.

**Correct Answer: A. Close observation and monitoring.**