The graph represents the profit earned on the sale of boxes of cookies. what does the slope represent? I already have the answer but, I don't know how to love it.

Option B is correct.
Since slope of a line y=mx is given as,
[tex]m=\frac{dy}{dx}[/tex]i.e. ratio of change in y to the change in x
Hence, slope for the given problem wiil be nothing but the
Value of the profit earned for each box of the cookie sold.
Hence, option B is correct.