Question

how would a person most likely contract gastroenteritis?
not canning food properly
not washing hands well enough
not storing food properly
not keeping food hot enough

Explanation:

Gastroenteritis is often caused by the ingestion of pathogens. Poor hand - washing can lead to the transfer of these pathogens (such as bacteria, viruses) from contaminated surfaces to the mouth. Improper canning (botulism risk), improper food storage (e.g., allowing bacteria to multiply), and not keeping food hot enough (e.g., for bacteria like Staphylococcus aureus) can also cause foodborne illness. But among these, not washing hands well enough is a very common way as it can introduce a wide variety of pathogens that cause gastroenteritis.

Answer:

not washing hands well enough