One common misunderstanding about food labels is: people think one box or package is the same as one serving. This misinterpretation can lead to people consuming more calories and nutrients than they intend to, as many packaged foods contain multiple servings per package, but consumers might not realize it if they don't check the serving size listed on the label.
The other options present some misinterpretations as well, but the misconception about servings versus packaging is particularly significant in terms of affecting dietary intake.