问题: Accordingtothepassage,itispossibletosavefivepercentofthetotalpassengercardemandforgaseachyear,if
A: peopleallsharecar-ridinginsteadofowningtheirowncars
B:allthecarscutoffonetripon10mileseachweek
C:twopeoplegoshoppingfromtimetotime
D:peopleusetelephonesinsteadofridingcars