**Core Concept**
The question is testing the student's knowledge of transient tachypnea of the newborn (TTN), a common respiratory condition in neonates, particularly those delivered by cesarean section. TTN is characterized by respiratory distress, which is often self-limiting and resolves within 48-72 hours.

**Why the Correct Answer is Right**
TTN occurs due to delayed clearance of fetal lung fluid, which leads to respiratory distress. The condition is more common in babies born by cesarean section because they do not experience the same degree of pressure on the lungs as babies born vaginally, which helps to expel fetal lung fluid. As the fluid is slowly cleared, the respiratory distress subsides, often within 48-72 hours.

**Why Each Wrong Option is Incorrect**
**Option A:** This option might be tempting, but it's incorrect because TTN typically resolves within 48-72 hours, whereas conditions like pneumonia or congenital diaphragmatic hernia may not show such a quick resolution.
**Option B:** This option is incorrect because TTN is a self-limiting condition that does not require treatment, whereas conditions like surfactant deficiency may require surfactant replacement therapy.
**Option C:** This option is incorrect because TTN is a benign condition that does not involve the cardiovascular system, whereas conditions like congenital heart disease may present with similar symptoms.

**Clinical Pearl / High-Yield Fact**
TTN is more common in babies born by cesarean section, and the condition often resolves on its own within 48-72 hours. It's essential to remember that the presence of perihilar streaking on an X-ray, along with the clinical presentation, can help diagnose TTN.

**Correct Answer:** B. Transient Tachypnea of the Newborn