To answer this question, we need to be careful with the variables in the graph. We have that:
• The variable, x, represents the number of songs downloaded, and
,• The variable, y, represents the total cost, in dollars, of the downloads.
Therefore, for the point (4, 12), we have that the graph represents x = 4, and y = 12, and it means that there were 4 downloads and a total of $12 for the 4 downloads.
Thus, the correct answer is option D: 4 downloads that cost a total of $12.