Is this your book?-.A. Yes this is B. Yes it is C. Yes she is

问题补充：

--- Is this your book? ---.

A. Yes, this is B. Yes, it is C. Yes, she is

答案：

解析：用this“这个”表示近指，that“那个”表示远指。回答时，用it来特指上文提到的物。故选B。