The RACI chart is a responsibility assignment matrix that helps define roles and responsibilities across project activities. It ensures clarity about who is responsible, accountable, consulted, and informed for each task or deliverable. The PMBOK Guide - Seventh Edition recommends responsibility assignment matrices such as RACI as part of stakeholder and resource management. Option A outlines communication plans but not roles. Option C visualizes workflow, not responsibilities. Option D communicates high-level objectives, not detailed responsibilities. References: PMBOK Guide - Seventh Edition, Resource Performance Domain PMI Practice Standard for Work Breakdown Structures ##############################################