I believe the answer is: b.aphasia
aphasia refers to a form of language impairment that affect our ability to speak, read, or write. The most common cause of aphasia is usually highly correlated with strokes. Around 40% of people who survived a stroke usually ended up with a certain level of aphasia for the rest of their life.
Katy was in a car accident and sustained serious brain damage. Since the accident Katy can speak only one word. This is an example of aphasia.
