Explanation
In economic terms, constant returns to scale is when a firm changes its inputs with the results being exactly the same change in outputs (production). In other words, if a firm increases its inputs they will see a proportional increase in production (or outputs).
The similar can be true if a firm decreases its inputs and that results in a proportional decrease in outputs. Constant returns to scale take place when increasing the number of inputs leads to an equivalent increase in the output.
Thus, the correct option is A.
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