Answer: Evaluate performance
Step-by-step explanation:
According to the given question, Greg is observing his company sales and also the profit quarterly by ignoring the step evaluating the performance in the marketing planning process.
The evaluating performance is one of the factor that basically helps in examine the proper management, activities and the outcome of the performance.
As, it helps in improve the effectiveness and also characteristics of the result that helps in managing the sales and the profit in an organization. Therefore, evaluate performance is the correct answer.