Which of the following statements about the burger is true?

The statement regarding burger sizes consisting of two quarter-pound patties is accurate because it reflects a common standard in many burger restaurants. This configuration allows for a substantial serving that satisfies a variety of appetites and can create a well-balanced flavor profile. By utilizing two quarter-pound patties, restaurants can also cater to customers who prefer more meat without overwhelming them with an excessively large burger. This choice helps in maintaining portion control while still providing a hearty meal.

The other options do not reflect standard practices in the culinary world. Burgers can be served with a variety of toppings beyond just lettuce, including tomatoes, onions, pickles, and various sauces. Additionally, they can be ordered in different configurations, including single patties, double patties, or even specialty sizes depending on the establishment. It’s also important to note that burgers are widely available on numerous menus, contradicting the claim that they are not available at all.