It is best described as a systematic, rational method of planning and providing nursing care for individuals, families, group and community
Correct Answer: B
Rationale: The nursing process (B) is a comprehensive, systematic framework used by nurses to deliver patient-centered care. It encompasses five steps: assessment (data collection), diagnosis (identifying health problems), planning (setting goals and interventions), implementation (carrying out the plan), and evaluation (assessing outcomes). This definition matches the description in the question as a rational, organized method applicable to individuals, families, groups, and communities. Assessment (A) is only the first step, not the entire method. Diagnosis (C) is a single phase focused on problem identification, while implementation (D) is the action phase, neither encompassing the full scope described. The nursing process integrates critical thinking and evidence-based practice to ensure holistic care, making B the accurate answer reflecting its broad, systematic nature.