The nurse is assessing a client's skeletal muscle movements and strength. Which action should the nurse instruct the client to perform to evaluate prime-mover muscle groups?

Rationale: A. Flex and hold as opposing force is applied: This technique evaluates the strength of prime-mover muscle groups by having the client actively flex against resistance. It allows the nurse to assess muscle function, endurance, and the ability to maintain strength against an external force. B. Perform sets of passive range of motion: Passive range of motion exercises assess joint flexibility and mobility but do not evaluate the client's active muscle strength since the movements are performed by the examiner rather than the client. C. Hold arms straight forward with eyes closed: This action is part of a neurological assessment, specifically testing for proprioception and balance (Romberg test), not a direct evaluation of muscle group strength. D. Stand on each foot without assistance: Standing on one foot assesses balance and coordination more than muscle strength. It involves neuromuscular control but does not directly isolate or test specific prime-mover muscle groups under resistance.