A business analyst is helping management determine which solution they should choose.

Opportunity cost is defined as the loss of potential gain from other alternatives when one alternative is chosen. In this scenario, by choosing Solution A over Solution B, the organization is foregoing the additional potential gain of $565,000 - $456,000, which equals $109,000. This is the opportunity cost of choosing Solution A.

References: The definition and calculation of opportunity cost can be found in various business and economic resources. For a detailed understanding, you may refer to the official CCBA® Learning documents and resources provided by the International Institute of Business Analysis (IIBA®).