**Core Concept**
ADP receptor inhibitors are a class of antiplatelet medications that work by blocking the action of adenosine diphosphate (ADP) on its receptors on the surface of platelets. This prevents platelet activation, aggregation, and subsequent thrombus formation.

**Why the Correct Answer is Right**
The correct answer is an example of a thienopyridine, a class of ADP receptor inhibitors that specifically target the P2Y12 receptor. By inhibiting this receptor, the drug reduces platelet activation and aggregation, which is useful in preventing thrombotic events such as myocardial infarction and stroke. The P2Y12 receptor plays a crucial role in platelet activation, and its inhibition is a key mechanism by which these medications exert their antiplatelet effects.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is a different class of antiplatelet medication that targets a different receptor.
**Option B:** This option is incorrect because it is a drug that inhibits a different enzyme involved in platelet activation.
**Option C:** This option is incorrect because it is a drug that has a different mechanism of action and targets a different pathway.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that ADP receptor inhibitors like the correct answer are contraindicated in patients with a history of bleeding disorders or those taking other anticoagulants, as they can increase the risk of bleeding.

**Correct Answer: C. Clopidogrel**