Step 1: Recall formula. Profit equals Total Revenue minus Total Cost. Step 2: Evaluate each option. - (A) Cost of production: Expenses to produce goods, not the difference. - (B) Input cost: Cost of resources, not the difference. - (C) Marginal cost: Change in total cost for one additional unit, not applicable. - (D) Profit: Correct, the remainder after costs are subtracted from revenue. Step 3: Conclusion. The term for the difference between revenue and cost is profit. Final Answer: \[\boxed{\text{Profit}}\]