What protein options are commonly found in IHOP's breakfast combos?

The selection of protein options in IHOP's breakfast combos is centered around traditional breakfast meats that are popular in American breakfast cuisine. Bacon, sausage, ham, and eggs are all common choices on typical breakfast menus, and they complement the classic pancakes and other breakfast items offered at IHOP. These proteins provide a hearty and satisfying addition to the meal, making them appealing for breakfast.

Other options presented, while they may contain protein, do not reflect the typical offerings at IHOP. For instance, chicken, turkey, and fish are not commonly featured in their breakfast combos, nor are salmon, nuts, or oats. Steak and tofu also do not align with the conventional breakfast expectations that IHOP emphasizes, which primarily focus on more traditional breakfast proteins. Thus, the selection of bacon, sausage, ham, and eggs aligns perfectly with IHOP's typical breakfast offerings and is the most logical choice for this question.