Final answer:
There are two main types of strokes: ischemic and hemorrhagic, both of which can lead to cerebrovascular accidents, resulting in brain cell damage or death.
Step-by-step explanation:
The correct answer to the student's question is C. Both A and B. A stroke, or cerebrovascular accident (CVA), can occur as either an ischemic stroke or a hemorrhagic stroke. An ischemic stroke happens when there is a loss of blood flow to a portion of the brain due to blocked or narrowed vessels. This can be caused by an embolus created by a blood clot or other obstruction. Hemorrhagic strokes occur when a blood vessel in the brain breaks, leading to bleeding within the brain. Both types of strokes result in damage to brain cells due to a lack of oxygen and nutrients needed for their survival.