**Core Concept**
ECG lead II, III, and aVF are used to assess the inferior wall of the heart. These leads are positioned to detect changes in the electrical activity of the inferior wall, which includes the right ventricle and the inferior part of the left ventricle.

**Why the Correct Answer is Right**
Ischemia or infarction of the inferior wall of the heart, as indicated by abnormal ECG leads II, III, and aVF, is typically associated with occlusion of the right coronary artery (RCA). The RCA supplies blood to the right ventricle and the inferior part of the left ventricle. Blockage of the RCA can lead to ischemia or infarction of the inferior wall, resulting in abnormal ECG findings in leads II, III, and aVF.

**Why Each Wrong Option is Incorrect**
**Option A:** Left circumflex artery (LCx) blockage is more likely to affect leads I, V5, and V6, which are associated with the lateral wall of the left ventricle.
**Option B:** Right coronary artery (RCA) is indeed the correct answer, but this option is incomplete and does not specify the correct vessel.
**Option D:** Left anterior descending (LAD) artery blockage is more likely to affect leads V2-V4, which are associated with the anterior wall of the left ventricle.

**Clinical Pearl / High-Yield Fact**
In the context of inferior wall MI, patients may present with atypical chest pain, such as epigastric or shoulder pain, due to the referral of pain from the inferior wall to other areas of the body.

**Correct Answer: C. Right coronary artery.**