Answer:
Mary Jo and Pam
Explanation:
A breach of warranty is a business term for a broken promise, which is made by the seller of a product or service. This is a violation of a contract between seller and consumer. In this case there was a agreement (through health regulations) that the large can of beans and franks meet a minimum standard of health and safety, by having pieces of metal in the can, this means that the promise is broken.
The only people who are affected would be the people who were injured due to the metal in the can, in this case those people are Mary Jo and Pam.