The correct statement is:
Diseconomies of scale can occur because of the difficulties in managing large enterprises as they increase in size.
The other statements are incorrect for the following reasons:
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"Marginal cost is the additional revenue that a firm takes on when it increases output by one unit." – This is incorrect because marginal cost refers to the additional cost incurred when producing one more unit, not additional revenue.
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"Diseconomies of scale will occur when a company experiences improved efficiency from managing large enterprises as they increase in size." – This is incorrect because diseconomies of scale are characterized by a decrease in efficiency and an increase in per-unit costs as a firm grows too large.
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"When economies of scale are found within the individual firm, they are considered external economies of scale." – This is incorrect because economies of scale within an individual firm are known as internal economies of scale, while external economies of scale refer to benefits that accrue to all firms in an industry or region as the industry grows.