During a single hour, an automatic camera photographed 100 vehicles that were speeding on a one-way road, and police a mile farther down the road photographed 49 vehicles that were speeding. Since every vehicle that passed the automatic camera also passed the police during the hour, the police photographed fewer than half of the vehicles that were speeding when passing them.
Which of the following is an assumption on which the reasoning in the argument above depends
A．Fewer than half of the vehicles that were speeding when they passed the police were already speeding when they passed the automatic camera.
B．Drivers who are not exceeding the speed limit are less likely than drivers who are speeding to reduce their driving speed when they see a marked police car.
C．Most of the vehicles that were speeding when they passed the automatic camera were still speeding when they passed the police.
D．More than 100 vehicles passed the automatic camera during the hour in which the automatic camera photographed 100 speeding vehicles.
E．(E) Not more than 100 vehicles drove past the police during the hour in which the police photographed 49 speeding vehicles.