Ice skating was a new experience for Leonard. He found that he had trouble keeping up with his friends, who had skated many times. After his first evening on the ice a friend invited him to go skating again. Leonard flatly refused, insisting that "It's not for me$$I stink at skating." Which of the following best describes the attribution Leonard is making to explain his failure at skating?

External, unstable

Internal, unstable

External, stable

Internal, stable