Unity is to division as agreement is to what?

The relationship established in the first part of the analogy, where unity corresponds to division, highlights a pair of opposites. Unity signifies a state of being together or in agreement, whereas division indicates separation or disagreement. This same kind of relationship needs to be mirrored in the second part of the analogy with the word "agreement."

In this context, the correct choice should refer to something that is opposite or contrary to agreement. "Dispute" fits this requirement perfectly, as it represents a state of disagreement or conflict, making it the direct opposite of agreement. Therefore, just as division is the opposite of unity, a dispute stands in opposition to agreement.

The other options do not convey this oppositional relationship. "Consent" suggests an affirmation of agreement, "collaboration" indicates working together towards a common goal, and "negotiation" implies a process aimed at reaching an agreement rather than opposing it. Thus, they do not maintain the necessary contrast that is evident in the first pair of terms.