Roberto made this scatter plot to show how the school record in the boys' 400-meter run has changed over time. Boys' 400-Meter Run Records Time (seconds) 521 51 50 49 48 0 5 10 15 20 25 30 35 40 45 50 Time (years) Roberto drew the line of best fit on the scatter plot. Which is the best interpretation of the slope of the line of best fit? A The current school record is about 46.5 seconds B. The school record has decreased at a rate of approximately 0.04 second per year. C. The school record has decreased at a rate of approximately 0.08 second per year. D. The current school record is about 50.5 seconds​