An oxygen saturation below 90% indicates inadequate oxygenation. First, the client should be assisted to return to bed (A) to minimize oxygen demands. Ambulation increases aeration of the lungs to prevent pooling of respiratory secretions, but the client's activity at this time is depleting oxygen saturation of the blood, so (B) is contraindicated. Increased activity increases respiratory effort, and oxygen may be necessary to continue ambulation (C), but first the client should return to bed to rest. Oxygen saturation levels at different sites should be evaluated after the client returns to bed (D).Correct Answer: A