Final answer:
The step Lisa should follow after identifying the problem and analyzing data is C. 'Identifying Alternatives,' which involves considering different potential solutions.
Step-by-step explanation:
After Lisa has identified the problem and compiled and analyzed data about it, the next step she should follow in the problem-solving model is Identifying Alternatives. This step involves considering various possible solutions to the issue at hand. Once alternatives are identified, Lisa can move forward with the additional steps of Setting Objectives, Implementing Solutions, and finally Evaluating Outcomes to fully address the customer's concerns and improve the situation.