**Core Concept**
The underlying principle being tested involves understanding the physiological changes in pregnancy and how pre-existing heart disease can affect these changes. Pregnancy induces a **hypercoagulable state**, increases **cardiac output**, and can lead to changes in **systemic vascular resistance**.

**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss a general concept that could apply: in pregnant females with heart disease, one might expect to see signs of **increased pulmonary pressures** or **decreased cardiac output**, among other things, due to the heart's inability to adapt to the increased demands of pregnancy.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific details, we can't address this directly, but generally, options that suggest no difference or an opposite effect of what's expected in heart disease during pregnancy could be incorrect.
**Option B:** Similarly, without specifics, we can infer that any option not aligning with expected pathophysiological changes in heart disease during pregnancy would be incorrect.
**Option C:** This would follow the same logic as above.
**Option D:** Again, without specifics, any option not reflecting the clinical examination findings associated with heart disease in pregnancy would be incorrect.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that pregnant women with pre-existing heart disease are at higher risk for complications, including **pulmonary edema** and **arrhythmias**. Understanding these risks is crucial for managing such patients.

**Correct Answer:** Not provided in the query.