The promoters of a regional soccer tournament had objectives related to the number of teams they would recruit, the amount of merchandise they would sell, and the amount of sponsorship revenue they would generate. Why is it important for them to periodically match their results with objectives?

a. It helps them clarify their vision

b. It helps them generate new ideas

c. It helps them identify and evaluate competitors

d. It helps them monitor and evaluate their marketing plan

e. All of the above