An older adult arrives at the emergency department with a probable diagnosis of a hemorrhagic stroke. The nurse understands, based on the client's age, that the most likely cause is which one of the following?

A. Decreased cardiac output: Low cardiac output can reduce cerebral perfusion and contribute to ischemic changes, but it is not a direct cause of hemorrhagic stroke. It more commonly leads to syncope or ischemic injury rather than bleeding in the brain. B. Uncontrolled hypertension: Chronic uncontrolled hypertension weakens cerebral blood vessel walls, making them prone to rupture. In older adults, this is the leading cause of hemorrhagic stroke, often resulting in intracerebral or subarachnoid bleeding. C. Intracranial hemorrhage: This describes the condition itself rather than the underlying cause. While intracranial hemorrhage is the event occurring during a hemorrhagic stroke, it does not explain why it developed in the first place. D. Thrombosis: Thrombosis leads to ischemic stroke rather than hemorrhagic stroke. It results from clot formation obstructing blood flow, whereas hemorrhagic stroke arises from vessel rupture and bleeding.