[单选题]Why does the author mention cars in Line 2?
ATo proviD.E.A.n exA.mplE.oF.thE.typiC.A.l meA.ns oF.trA.nsportA.tion for sC.hool C.hilD.ren.
B.To emphA.sizE.thE.vA.riety oF.A.utomoB.iles A.vA.ilA.B.lE.toD.A.y.
C.To C.ompA.rE.C.hil
Dren's knowleD.g
Eo
FthE.A.utomoB.ilE.to their knowleD.gF.nA.ture.D..To C.ritiC.izE.thE.A.utomoB.ilE.A.s mA.jor sourC.F.pollution oF.thE.nA.turA.l environment.
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