The _ between the two families led to bitter relations between their children.

Explanation

- Correct Answer: a. Dispute - Explanation: The sentence describes a conflict, and "dispute" means a conflict or disagreement. Why other options are not correct: - b. Cordial: Cordial means warm and friendly, which is the opposite of a conflict. - c. Encouragement: Encouragement does not fit the context of bitter relations. - d. Excitement: Excitement is not appropriate for describing bitter relations.