(Solution) - When average total cost is at its minimum A Average -(2025 Original AI-Free Solution)

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When average total cost is at its minimum:
A. Average variable cost is declining with increases in output
B. Average variable cost plus average fixed cost is declining with increases in output
C. Average total cost is equal to average variable cost
D. Marginal cost is equal to average variable cost
E. Marginal cost is equal to average total cost