Leftover should be used within this many days after preparation

Leftover should be used within this many days after preparation :
Consume them as soon as possible. It is best to consume the remains maximum within two days of their preparation. The longer food is kept and the risks of food poisoning are great. Discard leftovers that have been kept too long.

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.