Why should food be stored in airtight containers in the field?

Food should be stored in airtight containers in the field primarily to prevent pest infestations. When food is exposed to the environment, it can attract various pests such as insects and rodents, which can contaminate the food and lead to spoilage. Airtight containers create a barrier that helps keep these pests away, ensuring that the food remains safe and consumable for a longer period.

Proper storage techniques are crucial in field conditions where access to fresh food can be limited, and maintaining food safety is a priority. This practice also helps to preserve the quality and nutritional value of the food by limiting exposure to moisture and air, which can cause degradation and affect flavor. The other options do not address the primary reasons food safety and storage effectiveness.