What substitution should a guest make to ensure the Mediterranean Chopped Salad with Shrimp is gluten-free?

To ensure the Mediterranean Chopped Salad with Shrimp is gluten-free, omitting the croutons is the appropriate substitution. Croutons are typically made from bread, which contains gluten, and therefore removing them eliminates the gluten content in the dish. This modification allows the guest to enjoy the flavor and texture of the salad without the risk of gluten exposure, making it suitable for those with gluten sensitivities or celiac disease.

While the other options might change the dish, they do not specifically address the gluten concern as effectively. Removing the shrimp or using a different type of shrimp does not relate to gluten at all, and replacing the dressing could potentially introduce gluten if the new dressing contains gluten-based ingredients. Thus, omitting the croutons is the most straightforward and effective way to ensure the salad remains gluten-free.