Correct Answer: Pact

Solution : The correct choice is the first option.

Pact is the most appropriate one-word substitute for a formal agreement between nations or peoples because it directly conveys the idea of a formal agreement or treaty.

The meanings of the other options are as follows:

• Concord: Agreement, harmony, or mutual understanding. While it's related to agreement, it doesn't specifically refer to a formal agreement between nations.

• Bond: A connection or link between people or entities.

• Charter: Typically refers to a written grant of rights, or privileges or a formal document outlining the principles or rules of an organisation or institution.

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