The correct answer is B. Marginal production.
Marginal production is the increase in total output that results from employing one additional worker. It is calculated by taking the difference between the total output with one worker and the total output with no workers.
Total production is the total output of a firm or industry. It is calculated by adding up the output of all the workers in the firm or industry.
Average production is the total output per worker. It is calculated by dividing total output by the number of workers.
None of these is the correct answer because it does not describe the increase in total output by employing a new worker.