正解:D
The exhibit shows that Product C is facing critical issues in the 'Implement' stage, as indicated by the red box, and at-risk conditions in the 'Use' stage, as shown by the orange box. These indicators suggest that there are significant barriers preventing the successful implementation and use of Product C. Therefore, the first priority must be to identify and document these barriers to develop a plan to overcome them and ensure the product's success. References: Best practices in customer success management and product lifecycle management.