Final answer:
The Heaven-penetrating cooling method is likely related to a traditional cooling technique from the Taiping movement, which focused on the smooth flow of cosmic qi and embraced nature-oriented and meditative practices to achieve balance.
Step-by-step explanation:
The Heaven-penetrating cooling method (Tou Tian Liang) refers to a traditional cooling technique rooted in the practices of the Taiping movement during the late Eastern Han Dynasty. These followers of the Taiping movement believed that cosmic qi should flow smoothly to ensure health and harmony and likely employed methods along the lines of meditating, adjusting daily activities, and engaging with nature to achieve a state of balance and coolness, both spiritually and physically, as a part of their preparation for a new age of purity and enlightenment. Despite the details of the method not being fully clear, the choice closest related to the traditional practices described in the question would be 'a. Traditional cooling technique'. While the other options seem to have a modern or literal approach to cooling, a traditional cooling technique suggests practices deeply rooted in historical, possibly spiritual, methods.