Luis made an error when he used the distributive property to solve the problem shown. Which sentence describes the error? A: In Step 1, the expression should be x(60−15), not 60(x−15).

B: There should be no parentheses in Step 1. It should be 60⋅x=15.

C: In Step 2, 60 should be multiplied by the quantity 8−15, not by 8.

D: 8 was substituted for x at the wrong step.