Final answer:
The most likely percentage of Americans who eat at Giantburger restaurants every day is 7%.
Step-by-step explanation:
To determine the most likely percentage of Americans who eat at Giantburger restaurants every day, we need to analyze the given options and the information provided.
Option (A) 7% is the highest percentage among the given choices, so it is the most likely percentage. Therefore, within the context of the provided choices, option (A) at 7% stands as the most plausible estimate for the proportion of Americans visiting Giantburger on a daily basis, as it presents the highest figure among the available selections.