A、Helpful and polite employees. B、Good food for customers. C、Clean tables and floors. D、With food ads at the entrance. D

Fast-food restaurants are very popular in the United States. They are popular because the service is fast and prices are low. Of all the fast-food restaurants, McDonald’s is probably the most famous and the most popular.
    McDonald’s is popular for several reasons. Customers can get the same food at any McDonald’s in any state or country. The employees are helpful and polite, and the table and floors are clean. Ray Kroc, the past president of McDonald’s, believed that helpful employees, a clean restaurant, and good food were necessary.
    And McDonald’s customers do like the food. They like the sandwiches, the milk shakes, and the French fries. Of all the items on McDonald’s menu, the French fires are probably the most popular. They are good because of their special preparation.
    People go to McDonald’s because of the food, the fast service and the low prices. They say McDonald’s is their favorite place to eat in the whole world. They won’t move to any town that doesn’t have one.