阅读下列短文，从每题所给的四个选项（a、b、c和d）中，选出最佳选项。
it is quite reasonable to blame traffic jams, the cost of gas and the great speed of modern life, but manners on the road are becoming horrible．everybody knows that the nicest men would become fierce tigers behind the wheel．it is all right to have a tiger in a cage, but to have one in the driver''s seat is another matter．
