Which of the following is a risk factor for wood-destroying insect infestations?

High humidity levels are indeed a significant risk factor for wood-destroying insect infestations. Insects such as termites thrive in environments with higher moisture levels because these conditions support their life cycle and enable them to thrive. Wood that is exposed to high humidity can become a breeding ground for these pests, as they require moisture to survive and can easily penetrate damp wood.

Conversely, a low temperature environment can deter many wood-destroying insects, slowing down their activity and reproduction. Exposure to direct sunlight typically does not favor wood-destroying insects, as many of them prefer dark and moist locations to establish colonies. Frequent habitation by people may not directly influence wood-destroying infestations unless the human activities lead to conditions conducive to moisture or damage to structural wood. Therefore, high humidity is a key environmental factor promoting wood-destroying pest problems.