Answer: Has an UNSTABLE explanatory style.
Explanation: Explanatory style is a natural way to which an individual illustrate the meaning of an event or outcome.
There are various Explanatory styles. They include; internal/external; stable/unstable and global/specific.
An unstable explanatory style can be is when an individual believes whether an event will be same or subject to change. Peter believed that his failure was because he was sick, he believed that if he wasn't sick, he would have been successful. This explains an unstable/stable explanatory style.