What is the best way to prevent rodents from entering a building around electrical utility lines?

Applying an appropriate sealant is the most effective method for preventing rodents from entering a building around electrical utility lines. Rodents can exploit even the smallest openings to gain access to a structure. Using a durable sealant closes off gaps and crevices, creating a barrier that discourages ingress.

In the context of protecting buildings from rodent entry, the use of sealants is essential because they not only obstruct pathways but also can be made from materials that are resistant to gnawing and damage from rodents. This proactive measure is integral to maintaining building integrity and preventing potential infestations.

The other options do not provide effective solutions. For instance, leaving gaps for air circulation can actually create vulnerabilities, while merely using traps addresses an existing problem rather than preventing it. Ignoring minor holes is also unwise, as these seemingly insignificant openings can serve as entry points for pests. Thus, sealing gaps adequately is crucial for long-term rodent prevention.