Shawn's solution is marked incorrect. Which best explains Shawn's error?

A. Shawn added 4 to both sides of the equation
instead of subtracting 4.

B. Shawn multiplied by -5 on both sides of the
equation instead of multiplying by - 1/5

C. Shawn multiplied by -5 on both sides of the
equation instead of dividing by - 1/5

D. Shawn subtracted 3/5 x on the left side of the
equation instead of adding 3/5 x.