The uploaded study guide identifies C. User Flow as the correct UX method.
The key phrase is “series of steps to achieve a meaningful goal.” A User Flow represents how a user progresses through actions, decisions, screens, or states while attempting to complete a task. It therefore makes the relationship between individual steps and the final objective visible.
Option A, a User Persona, represents the user rather than the sequence of actions the user performs. Personas capture characteristics, needs, goals, behaviors, or pain points, but they do not primarily visualize task progression.
Option B, a Wireframe, represents the structure of an individual page or screen. Wireframes are useful for determining information hierarchy and interface layout, but they do not inherently document the complete sequence a user follows from one interaction to another.
The study-guide distinction is consequently straightforward: persona = who the user is; wireframe = how a screen is structured; user flow = how the user moves through steps toward a goal.
User flows help designers identify unnecessary steps, decision points, and transitions before detailed interface design is finalized.
Study Guide reference/topics: User Flow, task sequence, user goals, UX artifacts, UX Fundamentals.
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