During which annual food celebration does IHOP offer a special menu?

The correct choice is National Pancake Day because IHOP has a longstanding tradition of celebrating this day with special promotions and events related to pancakes. On National Pancake Day, IHOP typically offers customers a complimentary stack of pancakes and encourages them to make a donation to children's hospitals, making it a charitable event as well. This celebration reflects IHOP's brand identity as a pancake-centric restaurant, highlighting their signature menu items.

National Breakfast Month, while related to breakfast foods and potentially significant for IHOP, is not specifically tied to an annual event involving a special menu. National Waffle Day and National Muffin Day are also celebrations involving specific food items, but they do not pertain to IHOP's unique offerings or signature events in the same way that National Pancake Day does. Therefore, National Pancake Day stands out as the occasion when IHOP specifically rolls out a special menu and promotional activities centered around pancakes.