Which of the following can be added to a salad for an extra charge?

Grilled shrimp can be added to a salad for an extra charge because it is typically considered a premium protein option. Many restaurants, including TopGolf, often offer add-ons such as proteins to elevate a salad, which can contribute to a more filling and satisfying meal. This addition not only enhances the flavor profile of the salad but also adds nutritional value, making it more appealing for guests who prefer a heartier dish. In contrast, the other options like sautéed mushrooms, ranch dressing, and olives are usually included as part of the salad service or offered at no additional charge, focusing on complementing the base ingredients rather than significantly changing the dish's overall nature.