Explanation/Reference:
There is not a relationship type called linked. There are five relationship types among requirements.
necessity, effort, subset, cover, and value.
B is incorrect. Necessity is a relationship type that describes the linkage between requirements
based on the implementation of one requirement in order to add the second requirement.
D is incorrect. The subset relationship type describes the decomposition of one requirement to
more specific requirements.
C is incorrect. The cover relationship among requirements describes the top-level requirement of
a decomposed requirement.

Explanation/Reference:
Change-driven approaches to business analysis deal with rapid delivery of the business value. The business value is delivered in short iterations in return for acceptance of a higher degree of uncertainty regarding the overall delivery of the solution. The change-driven approaches are preferred while taking an exploratory approach for incremental improvement of an existing solution.
D is incorrect. Iterative is not a valid business analysis approach.
C is incorrect. 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.
A is incorrect. Progressive elaboration describes the project management approach of refining requirements and project scope, not the business analysis approach.

Explanation
When examining a business problem, it's always important to define the underlying source of the problem.
This identification can help resolve the matter faster and for less cost. This resolution can also help to prevent the problem from continuing with a new solution that doesn't properly address the problem.
Answer B is incorrect. Competition and their approach may be useful in some instances, but it's not the best
answer considering the question.
Answer A is incorrect. This isn't a valid answer for the question.
Answer C is incorrect. There's no evidence that a dataflow has been created, or even needs to be created.