Which of the following can be used to determine if requirements align to the product's objectives?

Business use cases are used to describe how an actor, external to the business, achieves a goal. They provide context for requirements by linking them directly to the value delivered to a user or the business. This ensures that each requirement serves a specific business purpose, thereby aligning the requirements with the product's objectives. By defining the interactions that lead to a valuable outcome, business use cases bridge the gap between high-level objectives and detailed functional requirements.

A. Five Whys is a root cause analysis technique used to explore the cause-and-effect relationships underlying a particular problem, not for aligning requirements to objectives.
B. Activity network diagrams are project management tools used for scheduling and sequencing project activities, unrelated to validating requirements alignment.
C. Context diagrams define the scope of a system by showing its boundaries and interactions with external entities, but they do not detail the alignment with business objectives.

Project Management Institute. (2017). The PMI Guide to Business Analysis. Section 5.3.3.3, p. 138. "Use cases are an effective way to discover and manage requirements... They provide context for the requirements and can be traced to business goals and objectives."

Project Management Institute. (2015). Business Analysis for Practitioners: A Practice Guide. Section 4.4.1, p. 61. "Use cases describe the interactions between a primary actor... and the solution to achieve a goal."