Solve: $5(x+4)=x+4$
$\begin{array}{ll}{\text { Step } 1 : 5 x+20} & {=x+4} \\ {\text { Step } 2 :} & {4 x+20=4} \\ {\text { Step } 3 :} & {4 x=24} \\ {\text { Step } 4 :} & {x=6}\end{array}$
Which is the first incorrrect step in the solution shown above?
A. Step 4
B. Step 3
C. Step 2
D. Step 1