You're on a game show and about to get the chance to win a brand new car. The game show host presents you with three doors, he tells you that behind one of the doors is the car and behind the other two doors there is a goat (so that's one car and two goats). You are told to pick one of doors where you think the car is behind, so you choose one of the doors but before you can get to open the door the host opens one of the other doors to reveal a goat (the host knows where the car is). Now the host gives you the option to either stick with your original choice or swap with what's behind the other unopened door. If you want the best chance to win the car which should you do?
A. Stay with your first choice.
B. Swap for the other door.
C. It doesn't matter.