Which of the following terms refers to an action taken to make an agreement official?

The term that refers to an action taken to make an agreement official is ratification. Ratification is the formal process by which a party signifies its assent to a new agreement, often following negotiation or preliminary approval. This can involve final consent by a legislative body or other governing authority, thereby giving the agreement or contract full legal force and effect.

In many contexts, especially within governmental and legal frameworks, ratification is crucial as it ensures that all parties involved are in alignment and have officially acknowledged the agreement's legitimacy. This step is essential in preventing misunderstandings and ensuring all signatories uphold the terms outlined in the agreement.

The other terms, while related to agreements and organizational processes, do not carry the same connotation of making something official. Rectification typically refers to correcting or fixing something rather than making an agreement official. Resolution can imply a decision reached by a group or governing body but does not necessarily denote formal acceptance or validation of an agreement. Reconciliation is the process of resolving differences and making peace between parties, which does not inherently involve the formalization of an agreement.