To solve the problem $9\times(10+5)-(7-2)$, John writes the steps below. In which step the first mistake was written?  Step $1$: $=9\times10+9\times5-(7-2)$  Step $2$: $=9\times10+9\times5-7+2$  Step $3$: $=90+45-9$  Step $4$: $=145-9$  Step $5$: $=136$ 
选项为:A:Step $1$  B:Step $2$  C:Step $3$  D:Step $4$  E:Step $5$  请回答其中一个选项.