Which door is safe?
One morning, little Mary got trapped in a castle in Costa Rica. There were 4 doors, but only one led to freedom. The doors opened up to the following:
1. Lava that would immediately melt anyone
2. A killer clown that would beat any person to death
3. A deadlock frost that would freeze her at once
4. Cops that would shoot any man or woman indiscriminately
Which door should Mary choose and why?