Final answer:
The most accurate and reliable outcome measure for evaluating an intervention is the achievement of stated goals.
Step-by-step explanation:
The most accurate and reliable outcome measure for evaluating an intervention is d) Achievement of stated goals. Patient satisfaction, nursing documentation, and length of hospital stay may provide valuable information, but they are subjective measures that can be influenced by various factors. On the other hand, the achievement of stated goals provides objective and quantifiable evidence of the effectiveness of the intervention.