Which of the following is considered a kids' menu option?

The kids' menu option is specifically designed to cater to younger diners, and it typically includes smaller portion sizes and items that appeal to children's tastes. The choice that aligns with this is a small curly fry, which is often served as a side item for meals targeted at kids. It is a fun and familiar food item that is popular among children, making it a suitable option for a kids' menu.

The other options, while they may be available on the menu, do not fit the typical criteria for kids' meals. Grilled chicken salad is more aligned with health-conscious adults, the cheese stick platter may not be as universally appealing to young children as a main menu item, and the breakfast burrito offers more complex flavors that may not be as suitable for kids. Therefore, the small curly fry stands out as the appropriate choice for a kids' menu offering.