Based on the available information, b. 70 is the most likely test score for someone who completes 14 assignments.
Based on the graph, the best prediction of the test score for someone who completes 14 assignments is b. 70. The line trends upwards, suggesting that as the number of assignments completed increases, the test score also increases. The point at 14 assignments is closest to 70 on the y-axis.
Here's a breakdown of the other options:
a. 20: This is too low, as the line is already above 20 at 2 assignments completed.
c. 50: This is also too low, as the line is closer to 70 than 50 at 14 assignments completed.
d. 100: This is too high, as the line doesn't reach 100 even at the highest number of assignments shown (14).