Concept:The law of diminishing marginal returns is linked to production and output, not to consumer satisfaction.
Explanation:This law applies in the short run, when at least one factor input such as capital is fixed.
When a producer adds successive units of a variable input like labour to that fixed input, total output tends to rise at first.
After a particular level of production, each additional worker adds less to output than the previous worker did.
This fall in the extra output is known as diminishing marginal returns.
It is therefore concerned with the output added by the variable factor of production.
Utility concepts such as total utility, average utility, and marginal utility belong to the consumer side and are not directly related to this law.
Among the given options, the only production-related concept is total product.
Answer:C. Total product.