Sentence 1: There was a murder on the 201 express night bus in Atlanta. 
 Sentence 3: The bus driver drove the bus to the police station 
 Sentence 4:  When the police entered the bus, there was only 5 passengers 
 Sentence 5:  The detective believed that the murderer got away somehow 
 Option 1: No one realized it until everyone had gotten off and the bus went back to the station. 
 Option 2: No one saw who among the 6 passengers killed the elderly man.