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B is corrent. While Butler is acting as Ace’s agent, Butler has implied authority to the extent reasonably necessary or usual to carry out the express authority of the principal (Ace). Selling business fixtures would not be considered an implied or normal duty of a business manager.
A is incorrect. Ace has expressly authorized Butler to act as business manager which implies the duty of paying Ace’s business debts.
C is incorrect. Ace has expressly authorized Butler to act as business manager which implies the duty of purchasing inventory.
D is incorrect. Ace has expressly authorized Butler to act as business manager which implies the duty of hiring and discharging employees.