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.