Final answer:
Ideal moisture content for baling hay to avoid mold growth and maintain nutritional value is between 16-20%.
Step-by-step explanation:
When baling hay, it's crucial to bale at the correct moisture level to prevent issues such as mold growth or spontaneous combustion. The ideal moisture level for baling hay is typically within the range of 16-20% (option b). At this moisture content, hay is dry enough to be stored without significant risk of spoilage but still contains enough moisture to retain its nutritional value and prevent too much leaf shatter during handling.