Alan Is a Retired Economist Who Enjoys Building Toy Trains

Alan is a retired economist who enjoys building toy trains for his grandkids.He uses a workbench and tools from his garage,lumber he bought from the lumber store for $10,and varnish and paint he had left over from another project last year.Since a retired economist is always an economist,which of the following statements does he make about building toy trains?

A) I'm not paying for any resources,so the toy trains I'm building are a good example of free goods.
B) I only paid $10 for the lumber,so the toy trains I'm building are a good example of free goods.
C) I'm using scarce resources to build the toy trains.
D) The resources I'm using to build the toy trains are not scarce.
E) If I had used lumber that I cut from the tree in my backyard instead of buying it from the store,then the toy trains I'm building would be a good example of free goods.