Ben and Ken have some books. After Ben sends $4$ books to Ken, he has $1$ book less than Ken. Which of the following is true? 
选项为:A:Originally, Ben had $3$ books more than Ken.  B:Originally, Ben had $4$ books more than Ken.  C:Originally, Ben had $1$ books less than Ken.  D:Originally, Ben had $9$ books more than Ken.  E:Originally, Ben had $7$ books more than Ken.  请回答其中一个选项.