Letter B shown in the image from an IVU examination below labels the: 
Definitions:
Labor
The effort by humans to produce goods or services in exchange for wages or other forms of compensation.
Total-Product Schedule
A table showing the output or total product resulting from various quantities of inputs or resources, used in production theory.
Marginal Revenue Product
The increase in revenue resulting from the utilization of one extra unit of a factor of production.
Resource
An economic or productive factor required to accomplish an activity or as means to undertake an enterprise and achieve desired outcome.
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