Choice A reason:

This is a correct answer. Frequent headaches are a common symptom of CTE, which is a progressive degenerative brain disease caused by repeated head trauma. Headaches may be triggered by physical or mental exertion, stress, or noise.

Choice B reason:

This is a correct answer. Memory loss is another common symptom of CTE, which affects the areas of the brain responsible for learning and recall. Memory loss may manifest as difficulty remembering names, dates, events, or conversations.

Choice C reason:

This is a correct answer. Personality changes are also a common symptom of CTE, which affects the areas of the brain responsible for mood and behavior. Personality changes may include irritability, aggression, depression, anxiety, impulsivity, or apathy.

Choice D reason:

This is a correct answer. All of the above are possible symptoms of CTE, which can vary in severity and onset depending on the individual and the extent of brain damage. Other possible symptoms include confusion, cognitive impairment, speech problems, vision problems, balance problems, motor problems, or suicidal thoughts.