Four elementary-aged children , two boys and two girls , play on a green lawn with a tree and a building in the background .
It is impossible that two boys and two girls are playing tag , but to the death .
It is impossible that two boys and two girls are playing tag , but to the death .
It is probable that two boys and two girls are playing tag , but to the death .
Two boys and two girls are playing tag , but to the death .