An agent's duty to account means that they must:
Keep all financial transactions and records secret from the principal
Refuse to provide any financial information to the principal
Provide regular and accurate reports on their financial activities to the principal
Withhold financial information unless specifically requested by the principal
An agent's duty to account requires them to provide regular and accurate reports on their financial activities to the principal. This includes keeping records of all transactions, providing receipts and invoices, and being transparent about any financial matters related to the agency relationship. Hence correct option is c.