Caitlin concluded that her husband was late for dinner because he was caught in heavy traffic. Her conclusion best illustrates

a situational attribution

Explanation:

Fritz Heider has introduced the concept of attribution during the 20th century. Fritz Heider argued that there two different types of attribution including situational or external attribution and personal or internal attribution.

Situational attribution: The term situational attribution is also referred to as environmental attribution and is defined as an individual tendency to describe one's or the other person's behavior, an outcome or an event based on the outside factors including luck, circumstances, etc.

In the question above, Caitlin's conclusion best illustrates a situational attribution.