Using the points on the following diagram,identify which combinations of these points illustrate diminishing returns to capital.Give a brief explanation to support your answer. 
Definitions:
Total Variable Cost
The overall expense that changes in direct proportion to the quantity of output produced or services offered.
Average Total Cost Curve
A graphical representation showing how the average cost of production varies with the level of output.
Marginal Returns
The additional output that is produced by using one more unit of a given input, crucial in determining optimal production levels.
Total Fixed Costs
Expenses that do not change with the level of output or production in the short term, such as rent, salaries, and insurance.
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