She should probably avoid football, wrestling and cheer-leading, both of these demand some amount of strength - I'd be able to answer better if you had given a list of sports.
Track/Swimming/Tennis/Soccer/Golf: These would all probably be fine.
I think the correct answer from the choices listed above is option B. Stability is an important skill for athletes because without good stability, athletes are too clumsy to perform well. Stability<span> is defined as resistance to both linear and angular acceleration, or resistance to disruption of equilibrium. Hope this answers the question.</span>