The tables below show four sets of data: set a x 1 2 3 4 5 6 7 8 9 y 10 9 8 7 6 5 4 3 2 set b x 1 2 3 4 5 6 7 8 9 y 3 4 5 6 7 8 9 10 11 set c x 1 2 3 4 5 6 7 8 9 y 8 6 5 4 3.5 3 2.5 2 2 set d x 1 2 3 4 5 6 7 8 9 y 1 2.5 2.5 3 4 5 6 8 9 for which set of data will the scatter plot represent a positive nonlinear association between x and y? (1 point) set a set b set c set d