A thing produced by labor is

A.) currency.

B.) a product.

C.) a resource.

A thing produced by labor would be considered as a product.

Currency is an item or multiple items that you would trade for something else (a set amount of items for a product or an object)

A resource is usually an object that creates a product.

The answer is B.

Because currency is mostly machines, not a lot of human labor there, and resources are natural. No labor there at all. A product is made by human labor to create an object, or a thing that people will buy and use.