Final answer:
The nurse should flex the client's knees and hips when placing them in the dorsal recumbent position.
Step-by-step explanation:
The nurse should choose option c) Flex the client's knees and hips when placing the client in the dorsal recumbent position. The dorsal recumbent position is a back-lying position where the client lies flat on their back with their knees and hips flexed. This position is commonly used for examinations, procedures, and rest in healthcare settings.