A teacher collected data to see if there was a relationship between how a student performed on a test and how long the student spent studying. A trend line has been drawn for the data. The equation for the line is: y = 0. 80x + 59. Which best interprets the slope of the linear model? a) a student who studied for 30 minutes is predicted to earn a grade of 80 points. B) a student who did not study for the test is predicted to earn a grade of 59 points. C) each additional minute of study time is associated with an additional 0. 8 points on the test. D) each additional 0. 80 minutes of study time is associated with an additional point on the test.