Question

in order to calculate marginal cost, producers must compare the difference in the cost of producing one unit to the cost of
purchasing a unit.
distributing that unit.
producing the next unit.
producing a different unit.

Explanation:

Marginal cost is the change in total cost when one - more unit is produced. So, producers compare the cost of producing one unit to the cost of producing the next unit.

Answer:

C. producing the next unit