Answer:
Mark has formed a dispositional attribution
Step-by-step explanation:
A dispositional attribution consists in assigning the outcome of an event to internal personality factors.
In this example, Mark has observed that Juan is a good team leader in basketball practice. Instead of thinking that Juan is a good leader because the game requires him to act in such a way (this would be an example of a situational attribution), he considers that Juan is himself a good leader, because he has the personality characteristics of one, regarless of the situation in which he might be involved.