Regarding Wholesaling, Which of the Following Is (Are) True

Regarding wholesaling, which of the following is (are) true?

A) Merchant wholesalers have higher sales than agent wholesalers, but their costs (as a percent of sales) are over three times as high.
B) There are many more manufacturers' sales branches than merchant wholesalers.
C) Manufacturers' sales branches have higher costs than agent wholesalers and account for a smaller percentage of total sales.
D) Good marketing managers select the type of wholesaler with the lowest cost when planning channels of distribution.
E) All of the above are true.