Which of the following does not serve as a barrier to entry in a monopolistic market?

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One company dominates the market due to its large sizeThe government grants exclusive production rights to a single companyProduction costs favor a single producer over multiple competitorsA crucial resource is controlled by only one company

Explanation

Option A is not a barrier to entry because merely being a large firm does not prevent others from entering the market. In contrast, options B, C, and D represent actual barriers: government-granted exclusivity, cost advantages that favor a single producer, and ownership of essential resources, respectively.