Which locations are common places to find an indoor carpenter ant nest?

Finding carpenter ant nests indoors is primarily associated with specific environments that provide the ideal conditions for their nesting habits. The correct answer highlights wall voids, attic areas, and insulation as common places for these nests.

Carpenter ants prefer to establish their colonies in areas that offer moisture and a source of wood for nesting. Wall voids are particularly attractive because they provide sheltered environments where ants can burrow into the wood without being easily disturbed. Similarly, attics harbor the kind of wooden structures and insulation that can retain moisture, making them appealing nesting sites. Insulation materials can also serve as protective layers, allowing the colony to thrive out of sight.

The other options reflect areas where ants might be found but do not encompass the optimal nesting sites as accurately. While basements, kitchens, and bathrooms could potentially host carpenter ant activity due to moisture, they are not as commonly identified as specific nesting locations as wall voids and attics. Closets and under sinks might attract some activity, but the structural features and conditions necessary for a large colony often align better with the spaces highlighted in the correct answer.