Answer - C - Clopidogrel interferes with platelet aggregation that impedes the formation of thrombi. This mechanism is to prevent further clogging of the arteries. Carotid endarterectomy is a surgical procedure to remove a build-up of fatty deposits (plaque), which cause the narrowing of a carotid artery, the primary blood supply to the brain. As the primary care provider to Laura, you should monitor for side effects, as well as encourage dietary and exercise behavior that will help limit artery plaque buildup and improve cardiovascular health.