Left over foods to be re-used in a buffet should be refrigerated promptly and:

Wash your hands often and recycle your trash instead of just throwing it away.

Answeraddiction; i know this to be true: )

The question may be incomplete (there are not the possible answers), but according to the scenario, kaley and her coworkers could be in a humanitarian organization like red cross (in the us or in other countries). it's an organization which organizes health and safety services, disaster services, and blood donations.