Key word here is the 'rationale" the why. Techniques for these include, scope modeling, business model canvas, decision analysis, business rule analysis and ROOT CAUSE ANALYSIS (fishbone Diagram as an element). Yes i see why you might think this isn't suppose to be a technique but of cause it is because it is an element that specifically addresses ths particular scenario as opposed to business capability analysis that is focused on features and functions of an enterprise as specifically identifying the performance gap between the current and future state and doesn't tell us the reason. Ans is D