Which of the following is a reason for diminishing rather than constant returns to specialization?

Question

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Diminishing returns to specialization occur when there are different goods that use different resources in different proportions. As a country specializes in the production of a certain good, it may have to allocate increasingly scarce resources to produce additional units of that good, decreasing the resources available for the production of other goods. This results in diminishing returns to specialization.

Which of the Following Is a Reason for Diminishing Rather