Name a preventative measure for keeping ants out of buildings.

Sealing cracks and crevices is an effective preventative measure for keeping ants out of buildings because it eliminates potential entry points. Ants can find their way into structures through even the smallest openings. By meticulously sealing these gaps with appropriate materials, it becomes significantly more challenging for ants to access the interior spaces, thereby reducing the likelihood of an infestation.

Preventing access is crucial in ant control strategies, and sealing points of entry is one of the most straightforward and proactive approaches. This method doesn't just stop ants that are currently present but also helps minimize future incursions. Other options do not effectively limit access or might even exacerbate the problem by creating an inviting environment for ants.