Answer:
Popularity.
Step-by-step explanation:
Appeal to popularity is logical reasoning where the belief is held based on the popularity of the issue. In other words, it is when an issue is deemed right just because most people deemed it true, thereby making the opinion decided based on the popularity.
This false logical reasoning is made when one idea is passed to be true because most people deemed it so. In the case of Amanda, her statement that "most Americans prefer to shop online rather than in stores" is based on an opinion and not proved. Just because lots of people agree to it, the general assumption is that it is true. This is what is understood as popular appeal fallacy.
Thus, the correct answer is popularity.