The correct answer is TRUE.
The dependent variable in the chart is the population (Y). On the other hand, the value that Y will take depends on different values of the qualitative variable country (X). In a qualitative variable like X, instead of values, there are different labels. Under the label United States, there will be a corresponding specific value of X. Y is the dependent variable while X is the independent one that defines the first.
X (country) is an independent variable.