Four runners are competing in a race , on an indoor course , decorated with many colorful , international flags .
It is probably the case that the runners pass by an American flag , a Canadian flag and a Mexican flag .
It is probably the case that the runners pass by an American flag , a Canadian flag and a Mexican flag .
It is impossible that the runners pass by an American flag , a Canadian flag and a Mexican flag .
The runners pass by an American flag , a Canadian flag and a Mexican flag .