3. A math teacher plotted her students' grades on the last unit test and the number of minutes they studied for the test. 100 Grade on Unit Test 10 20 30 40 50 60 70 80 90 100 Number of Minutes Studying Which statement best describes the data above? A. Students gained about 7 points on the unit test for every 10 minutes of studying. B. Students were likely to pass the test even if they did not study. C. No students studying less than 1 hour passed the test with a score of 70 or higher. D. Studying had no effect on the students' test scores