What is a critical element in preventing insect infestations?

Preventing insect infestations relies heavily on proper food storage and sanitation practices. When food is stored correctly—sealed, in clean containers, and kept at appropriate temperatures—it minimizes the chances of attracting pests, as insects are often drawn to easily accessible food sources. Additionally, maintaining a clean environment by regularly sanitizing surfaces removes food residues that could tempt insects. This proactive approach creates a less inviting habitat for pests, thereby significantly reducing the likelihood of infestations.

The other options do not effectively address the root causes of insect infestations. For instance, keeping doors locked may help control access but does not prevent insects that can enter through other openings or come in with deliveries. Frequent use of insecticides can help control pests but should not be relied upon as a primary prevention strategy, as it might lead to resistance and does not address the underlying issues of food availability and sanitation. Ignoring minor pest sightings is counterproductive; it allows potential infestations to grow unchecked, leading to larger problems later on.