—You look so tired after working long hours .Why not just take a rest?

—      .

A．Maybe I should                                          B．You can’t afford it

C．You don’t know                                         D．I can’t tell you

—You look so tired after working long hours.Why not just take a rest?

—________.

A. Maybe I should　　　 B. It just depends

C. You don't know　　　 D. I can't tell you