Final answer:
Mom's Pizza demonstrates its ethical culture by consistently adhering to its ethical policies, as evidenced by the action of returning an over-delivery to a supplier.
Step-by-step explanation:
The scenario given describes a local pizza restaurant, Mom's Pizza, where the employees observe the management consistently adhering to the ethical policies stated in the company's code of ethics. Examples such as notifying a supplier about an accidental over-delivery of tomatoes demonstrate this commitment. Therefore, Mom's Pizza maintains an ethical culture.