Final answer:
The correct setting for a humidistat control in winter is typically around 30 to 40 percent to maintain comfort and prevent window condensation, making B) 40% the recommended setting.
Step-by-step explanation:
The humidistat control should be set within a range to maintain a comfortable and healthy indoor environment during the winter. The recommended indoor humidity level is between 30 and 50 percent. Considering that warmer air can hold more moisture and that winter air is generally colder and drier, a setting around 30 to 40 percent is often recommended to prevent condensation on windows and to keep the air from becoming too dry. Therefore, the correct answer for the humidistat setting in winter time would be B) 40%. However, adjustments may be necessary based on specific home conditions and personal comfort.