Betsie tried to solve an equation step by step. \qquad\begin{aligned} 3(a+7)&=-33 \\ a+7&=-11&\green{\text{Step } 1} \\ a&=-4&\blue{\text{Step } 2} \end{aligned} 3(a+7) a+7 a =−33 =−11 =−4 Step 1 Step 2 Find Betsie's mistake. Choose 1 Choose 1 (Choice A) A \green{\text{Step }1}Step 1start color #28ae7b, start text, S, t, e, p, space, end text, 1, end color #28ae7b (Choice B) B \blue{\text{Step }2}Step 2start color #6495ed, start text, S, t, e, p, space, end text, 2, end color #6495ed (Choice C) C Betsie did not make a mistake.