A nurse in a clinic is interviewing a client who will undergo diagnostic testing. The nurse should ask about a client's potential allergies during which phase of the nursing process?

A. The planning phase involves setting goals and determining interventions based on the assessment data. B. The assessment phase is where the nurse gathers information about the client's health history, including potential allergies, which is essential for safe care and diagnostic testing. C. The implementation phase involves carrying out the planned interventions, which would include considerations for allergies but not the initial questioning about them. D. The evaluation phase assesses the effectiveness of the interventions and the client's response to care, which is not the appropriate time to inquire about allergies.