Which equation shows the associative property inaction?Which equation shows the associative property inaction?
a.8 + 6 + 7 = 8 + 7 + 6a.8 + 6 + 7 = 8 + 7 + 6
b.(10 + 5) + 15 = 10 + (15 + 5b.(10 + 5) + 15 = 10 + (15 + 5
c.9 + 0 + -1 = 9 + -1c.9 + 0 + -1 = 9 + -1
d.-2 (1) 9 = -2(9)d.-2 (1) 9 = -2(9)