已知执行“[student@localhost~] $ cat file ”的结果是：
This is chapter.
This is chapter123
This is oschapter1
则执行“[student@localhost~] $ grep chapter[0-9] * file”的结果是（）
A.
This is chapter.
This is chapter123
B.
This is chapter123
This is oschapter1
C.
This is chapter.
This is oschapter1
D.
This is chapter.
This is chapter123
This is oschapter1
正确答案是B