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Frank tried to solve an equation step by step.$\newline$\begin{array}{ll} -5 = 5(d + 4) \\ -5 = 5d + 20 & \text{Step 1} \\ 15 = 5d & \text{Step 2} \\ 3 = d & \text{Step 3} \ \end{array}$\newline$Find Frank's mistake.$\newline$Choose $1$ answer:$\newline$$(A)$ Step $1$ $\newline$$(B)$ Step $2$ $\newline$$(C)$ Step $3$