Explanation
According to 'A Guide to the Business Analysis Body of Knowledge', models are ideal because they abstract and simplify reality. They help simplify reality in a way that's useful for understanding the requirements and their impact on the organization.
Answer C is incorrect. This isn't a valid statement about why it's important to use a model.
Answer D is incorrect. Models do not show the solution in a non-functional portion of the organization.
Answer B is incorrect. Models do not restrict the attributes of the solution.

Explanation
The plan-driven approach defines business analysis activities. This approach is used to focus on minimizing up-front uncertainty and to ensure that the solution is fully defined before implementation begins in order to maximize control and minimize risk. It is preferred when requirements are effectively defined in advance of implementation.
Answer C and A are incorrect. These are not valid approaches for the business.
Answer B is incorrect. The change-driven approach does not focus on minimizing up-front uncertainty.

Explanation/Reference:
When customers experience the same process, such as checkout in different ways, it's frustrating. This improvement opportunity aims to create consistency in all behaviors to improve the customer experience.
B is incorrect. Automating or simplifying the work people perform helps streamline costs and
improve quality by doing the work in the same way each time the work is performed.
A is incorrect. Eliminating redundancy considers that stakeholders may have common needs that
can be met with a single solution, reducing the cost of implementation.
D is incorrect. While this choice is tempting, it's not an actual improvement opportunity for the
business analyst to consider.