Which of the following equations is not a correct use of the

Which of the following equations is not a correct use of the distributive property to simplify computation?
A. -3 (19) = -3(20) -3 (-1)

B.-3 (19) = (-3)(20) +(-3)(1)

C.-3 (19) = (-3)(20) + (-3) (-1)

D. -3 (19) = (-3)(10) + (-3) (9)

Solution

19=20 +(-1) or 19=10+9
19 does NOT equal 20+1
therefore B is not a correct use of the distributive property