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A sequence diagram shows objects/participants (lifelines) and the messages exchanged over time to fulfill a scenario. It is ideal for clarifying interface contracts, call order, synchronous vs. asynchronous behavior, and exception handling—critical for integration-heavy systems. Activity diagrams (Option A) model workflow/decision logic but deemphasize who talks to whom and in what order. State machines (Option C) capture how an entity changes states in response to events—useful for protocol or device behavior but not multi-party conversations. Use case diagrams (Option D) visualize actor–use case relationships at a high level; they don’t specify timing or message order. CAPM business analysis practices encourage choosing diagrams that best reduce ambiguity for the audience. Sequence diagrams complement a context diagram and data dictionary: together they provide boundary, semantic, and temporal clarity. They also support test design (mocking interfaces, contract tests) and expose risks like race conditions or tight coupling that could impact nonfunctional requirements such as performance and reliability.