What environmental factor can significantly attract termites?

The correct answer identifies wood-to-soil contact as a significant environmental factor that attracts termites. Termites are typically found in or near soil, as they require moisture to survive and thrive. When wood structures come into direct contact with the soil, it creates an ideal environment for termites to access their food source, primarily cellulose found in wood.

Soil provides the necessary humid habitat for termites, helping to keep them moist and allowing them to move easily between the soil and the wood. This contact also makes it easy for termites to build their colonies within structures, especially if there are conducive conditions like high humidity or dampness in the area.

Other environmental factors listed do not serve to attract termites as effectively as wood-to-soil contact. Low humidity levels would make the environment less hospitable to termites, while exposed sunlight generally deters them since they prefer dark and moist areas. High outdoor temperatures can also be less favorable, as excessive heat may dry them out or make them more inactive, whereas the moist and sheltered environment provided by soil is what truly invites termite activity.