The graph shows the amount of money the drama club raised based on the number of sweatshirts sold.

which list shows the independent quantities in the graph?

I believe you are asking about dependent and independent variables. 

Independent variables are the input in an experiment or equation.

Dependent variables are like the output of an equation or experiment 

So if you have y = x + 2 

x is your input that is the thing that you change

y is the output, it is dependent on the value that you give x so y is the dependent variable. 

So as it is in most cartisian coordinate graphs your x-axis generally is your independent variable making your y-axis your dependent variable. 

In your case is the amount of money the drama club makes dependent on the number of sweatshirts they sell 

or 

is the number of sweatshirts they sell dependent on how much money they have.