Okay. The x-axis is the time and the y-axis is the amount filled. If you look at the line, you see that less than 1 box is filled per minute. Therefore, B is out. A is also out as well, because those amounts would mean the line would be steeper and hit a number higher than 1 at the one minute mark. But, you do see that 3 boxes are filled every 4 minutes, especially with 6 at the 8 minute mark and 9 at the 12 minute mark. When you divide 3 by 4, that's a unit rate of 0.75 boxes filled per minute. Therefore, the answers are C and D.
