According to the FDA article on contaminated cantaloupes, which of the following was responsible for the growth of the bacteria?

I think the answer is B

The packing equipment was not easily cleaned and sanitized; washing and drying equipment used for cantaloupe packing was previously used for postharvest handling of another raw agricultural commodities.

There was no pre-cooling step to remove field heat from the cantaloupes before cold storage. As the cantaloupes cooled, there may have been condensation that promoted the growth of Listeria monocytogenes.

The packing facility's design allowed water to pool on the floor near equipment and employee walkways.

The packing facility floor was constructed in a manner that made it difficult to clean.