Final answer:
The speaker's attitude in the given dialogue about kids fighting is primarily optimistic about the kids' future, suggesting a belief that their present behavior is a phase that won't affect their eventual success.
Step-by-step explanation:
In the dialogue, the speaker exhibits several attitudes toward the kids fighting, but the primary attitude is c. Optimistic about kids' future. There is a sense of acceptance and a hint of indifference in the statement "It's no big deal. Never mind," which could suggest a laid-back approach to the children's arguments.
However, the optimism comes across more strongly in the comment "I bet they'll grow up to be great people," which indicates a positive outlook on the children's development despite their current behavior.
The speaker doesn't seem overly concerned or critical of the children's behavior; instead, the speaker seems to believe that the fighting is a phase that will not impede the children's ability to become successful individuals.