Answer:
b. made an internal attribution.
Explanation:
Internal attribution: In social psychology, the term has been introduced by Heider, who has given the attribution theory in which he has mentioned that there are two types of attribution i.e, internal and external.
Internal attribution: The term internal attribution is also referred to as dispositional attribution, and is defined as the phenomenon in which a person blames or targets the personal reason as the cause of a particular situation instead of the situational or environmental attribution.
In the question above, the given statement signifies that Dallas has made an internal attribution.