**Core Concept:**
In patients with pulmonary fibrosis, the lungs become stiff and scarred, leading to a condition called pulmonary hypertension. This results in increased afterload on the heart, increasing the risk of arrhythmias, such as atrial fibrillation, due to altered autonomic regulation and electrolyte imbalances.

**Why the Correct Answer is Right:**
The correct answer, **D:** Amiodarone, is an antiarrhythmic drug that can cause pulmonary toxicity due to its iodine content. This toxicity can worsen the underlying pulmonary fibrosis, leading to increased lung stiffness and worsening of pulmonary hypertension.

**Why Each Wrong Option is Incorrect:**
Option **B:** Verapamil is a calcium channel blocker used for arrhythmias, but it does not cause pulmonary toxicity.
Option **C:** Digoxin is a cardiac glycoside that can cause digitalis toxicity and worsen pulmonary fibrosis. However, it is not as toxic to the lungs as Amiodarone.
Option **A:** Sotalol is a beta-blocker and antiarrhythmic drug, but it does not cause pulmonary toxicity.

**Clinical Pearl / High-Yield Fact:**
Avoiding Amiodarone in patients with pulmonary fibrosis is crucial due to the risk of exacerbating pulmonary hypertension and worsening the underlying fibrosis. In such cases, other antiarrhythmic drugs like Verapamil, Digoxin, and Sotalol are safer options for controlling arrhythmias.