All the following offer rationale regarding why the grocery segment has a higher gross margin than the food service segment, except -

a. It is easier to take advantage of the firm's brand name in the retail segment to charge higher prices

b. The retail segment is less competitive than the food service segment because there are many more retailers to sell to then wholesalers

c. It is likely that the retail segment sells a more expensive mix of products

d. The retail segment has higher sales revenues