challenge: What is the primary advantage of using pre-mixed plaster in plaster spraying?
  
  A. Any surplus can be recycled, almost eliminating waste, and eliminates the need to haul water and mix the plaster from powder
  B. It is more cost-effective than classic gypsum-based plaster
  C. It is only suitable for small drywall areas
  D. It can be applied at a higher temperature than classic gypsum-based plaster
  Answer: 