Salad Bars Have Helped Reduced Costs in Restaurants.How

Salad bars have helped reduced costs in restaurants.How?

A) Customers eat less salad when they use a salad bar.
B) Customers who serve themselves at a salad bar do not have to be served by a waitperson.
C) Salad bars prominently feature inexpensive ingredients.
D) Customers eating salad do not complain so much about how slow the cooks are.
E) Customers who eat salad first are satisfied with smaller servings of meat.