Correct Answer: Hostility

Solution : The correct antonym for "harmony" is the first option.

Explanation: Harmony refers to a state of agreement, order, or concord. The opposite of harmony is a state of conflict, opposition, or hostility. Hostility is the most appropriate antonym, as it represents a state of being unfriendly or in conflict, opposite to the idea of harmony.

The meaning of the other options is as follows:

• Congruity : It means agreement or harmony.
• Consent : Consent refers to agreement or approval.
• Concord : It means agreement or harmony.