Answer:
Evaluating a solution.
Explanation:
Evaluation is the process of validating or deciding or making a judgment on something. This means that the decision to choose or prefer one thing for another is known as the evaluation process.
The need to reflect whether the addition of a salad bar to school lunch is the solution to a problem is an example of a solution evaluation. This will allow whether the addition will solve the problem or is required for the final goal desired.
Thus, the correct answer is evaluating a solution.
