Final answer:
To model the rationale or the 'why' of a change, Kevin should use Risk assessment, which evaluates potential risks and their impact on the change initiative. This includes the assessment of marginal costs and benefits, providing insights into the decision-making process.
Step-by-step explanation:
If Kevin wants to model the rationale or the 'why' of a particular change, the technique that would be most suitable for this task is C) Risk assessment. Risk assessment involves identifying potential risks and evaluating how they might affect a project or a change initiative. This evaluation would include looking at the potential benefits and drawbacks, and understanding the rationale behind the change could be a crucial part of this assessment. Comparing the marginal costs and marginal benefits could be part of Kevin's risk assessment, guiding him to make a well-informed decision about the change. While scope modeling, time management, and budget analysis are all important project management tools, they do not primarily focus on the 'why' of change. Instead, they focus on what needs to be accomplished (scope), when (time), and at what cost (budget).