Final answer:
The primary benefit of Gage R & R is that it can help to determine whether a measurement method is accurate. Therefore, the correct option is D.
Step-by-step explanation:
The primary benefit of Gage R & R is that it can help to determine whether a measurement method is accurate. Gage R & R, which stands for Gauge Repeatability and Reproducibility, is a statistical analysis method used to assess the variation in measurement systems. By conducting a Gage R & R study, you can identify the sources of variation in your measurement process and evaluate the accuracy of your measurement system.