If Anna takes one step forward, it means she walks $"+1"$ step; If Anna takes one step backward, it means she walks $"-1"$ step. Now, Anna walks $"-5"$ steps, then she walks $"+4"$ steps, then she walks another $"-1"$ step. Anna\textquotesingle s position is from her original location. 
选项为:A:$1$ step forward  B:$1$ step backward  C:$2$ step forward  D:$2$ step backward  请回答其中一个选项.