Which of the following is NOT a side option at Jack in the Box?

The correct choice is the Fish Sandwich because it is a main menu item rather than a side option. At Jack in the Box, sides typically consist of items that complement the primary food offerings, such as appetizers or smaller bites designed to be enjoyed alongside a main dish. The Fish Sandwich, being a standalone meal item, does not fit into this category of sides.

On the other hand, the other options listed are indeed considered side items. 3 Egg Rolls and Jalapeno Poppers are both popular choices that can be ordered in addition to main meals, providing customers with a larger variety of flavors and textures. Similarly, Donut Holes are a sweet treat that can serve as a side or dessert, aligning with the informal dining experience commonly found at Jack in the Box.