Critical Reasoning (CR) | Because the number of surgeons is growing faster than the number of op

Because the number of surgeons is growing faster than the number of operations and because noninvasive medical therapies are increasingly replacing surgery, the average annual number of operations per surgeon has fallen by one-fourth in recent years. It can be concluded that, if these trends continue, a dangerous decline in the level of surgical skill will occur.

The argument above is based on which of the following assumptions?

(A) A surgeon's skill cannot be properly maintained unless the surgeon
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