Question: Which of the following is a correct statement?
A: Average total cost equals marginal cost plus average fixed costs.
B: Average total cost equals marginal costs plus average variable costs.
C: Average total cost equals average fixed costs plus average variable costs.
D: Total fixed costs vary with output.
Please eliminate two incorrect options first, then think it step by step and choose the most proper one option. In your entire response, the letter r should appear less than 45.
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