In the term hyperactive,the prefix hyper- means:

A) excessive.
B) good.
C) difficult.
D) slow

Hyperactive

Hyperactive describes a condition of having more energy and movement than is normal or desirable, often associated with attention deficit hyperactivity disorder (ADHD).

Hyper-

A prefix meaning above or excessive, used to describe conditions of overactivity or elevated levels (e.g., hypertension).