Which of the following practices could help in preventing subterranean termite infestations?

Keeping wood piles away from the structure is a highly effective practice in preventing subterranean termite infestations because termites are drawn to wood as a source of food. When wood piles are stored close to a building, it creates an ideal pathway for termites to gain access to the structure. By maintaining a significant distance between wood piles and the foundation of the home, the chances of termites finding their way inside are greatly reduced. This preventive measure is part of proper pest management and helps to safeguard the property from potential damage caused by termite activity.

Other practices mentioned, such as installing skylights, using porous materials for foundations, and increasing outdoor lighting, do not have a direct impact on preventing subterranean termites. Termites primarily infest through the soil and wood, and these other options do not address the underlying issue of providing food or pathways for termites to reach the structure. Thus, maintaining appropriate distances for potential food sources, like wood piles, is key in effective termite prevention.