Choose the sentence that has closest meaning to the first one

Choose the sentence that has closest meaning to the first one
If the work is finished by lunchtime, you can go home
A. Unless the work is not finished by lunchtime, you can't go home
B. Unless the work is finished by lunchtime, you can go home
C. Unless the work is finished by lunchtime, you can't go home
D. If the work is finished by lunchtime, you can't go home