A marathon runner is interested in split times, which is the time to complete the first half of the race and the second half of the race. She collects split times for 10 runners and summarizes the data in the table. The equation of the least-squares regression line is ŷ = –51.0 + 1.44x, where ŷ is the time (in minutes) to finish the second half of the race and x is the time (in minutes) to finish the first half. Which shows the residual plot?