Which beverages do not include free refills at Denny's?

The correct choice indicates that milk, juice, shakes, and smoothies do not come with free refills at Denny's. This is consistent with the policy of providing complimentary refills primarily on certain beverages like coffee, soda, and iced tea.

In the case of milk, juice, shakes, and smoothies, these beverages typically involve more complex preparation or specific ingredients that may not justify a free refill policy. They are often considered specialty drinks that carry different price points and customer expectations. Therefore, when customers order these items, they are likely paying for each one individually rather than receiving them with unlimited refills.

Understanding this distinction helps servers explain beverage options to customers clearly, ensuring they are informed about what to expect regarding their drinks.