A157Yes, but it may take several decades before fuel-cell cars, which are said to be the ultimate low-emission vehicles, are widely used. It is hoped that hybrid cars combining gasoline and electric motors will rapidly improve gas mileage and become more popular in the future. They are being developed by Honda Motor Co., Ltd., Toyota Motor Corp. and other automakers. The increasing price of crude oil has led to a sudden jump in the retail price of gas, which will further strengthen the need for low-fuel-consumption vehicles.

(a) 20%
(b) 40%
(c) 60%