31. I will give you a specific car if you will marry X this year. Which of the following is incorrect? (C) If the year has ended, no marriage taking place and both parties are still alive, just the same my obligation is extinguished because the time indicated has already elapsed.*

(A) If on December 8 of this year X dies without marriage, my obligation is effective because one party is dead, marriage is impossible to take place.

(B) If on December 8 X dies without marriage, my obligation is extinguished because one party is already dead.

(C) If the year has ended, no marriage taking place and both parties are still alive, just the same my obligation is extinguished because the time indicated has already elapsed.

(D) If you marry X on December 8 my obligation is to give you the specific car.

Brief explanation will do. Thanks!