Last season at City Opera House, far more people attended opera X than opera Y. However, opera Y generated far greater net profits for City Opera House than did opera X. Each of the following could directly explain the result indicated above EXCEPT:a. a difference in the ticket prices of operas X and Y
b.a difference in the operating expenses of operas X and Y
c.a difference in the subject matters of operas X and Y
d.a difference in the merchandise sales associated with operas X and Y