What do economists call the physical things that firms make (things that can be seen or touched) ?

a. supplies

b. capital

c. goods

d. services

Those are goods (the answer is c!)

Goods are all the objects that people would want to buy and possess or use. For example, cars and books are goods.

Goods are one of two basic commodities, the other one is the intangible commodity, which is called services.