**Core Concept**
Right atrial hypertrophy is a condition where the right atrium becomes enlarged, often due to increased pressure and workload. This can be caused by various conditions such as tricuspid regurgitation, pulmonary embolism, or congenital heart diseases. The ECG is a crucial tool for diagnosing and assessing the severity of right atrial hypertrophy.

**Why the Correct Answer is Right**
In right atrial hypertrophy, the right atrium experiences increased wall tension, leading to depolarization changes on the ECG. The P wave, which represents atrial depolarization, becomes taller and more peaked due to the increased muscle mass of the right atrium. This is known as P pulmonale. The P wave amplitude is typically greater than 2.5 mm in leads II, III, and aVF, indicating right atrial enlargement.

**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a specific ECG finding associated with right atrial hypertrophy.
* **Option B:** Left atrial hypertrophy is characterized by a broad, notched P wave in leads II, III, and aVF, not a tall, peaked P wave.
* **Option C:** Right ventricular hypertrophy is characterized by a right axis deviation and an R wave greater than 1 mm in leads V1 and V2, not a tall P wave.
* **Option D:** This is not a specific ECG finding associated with right atrial hypertrophy.

**Clinical Pearl / High-Yield Fact**
Remember the mnemonic "P pulmonale" to associate a tall, peaked P wave with right atrial hypertrophy, especially in leads II, III, and aVF.

**Correct Answer: B. Left atrial hypertrophy is characterized by a broad, notched P wave in leads II, III, and aVF, not a tall, peaked P wave.**