单选题 There is now increased competition among motor-vehicle manufactures___ has resulted inbetter cars at lower prices.
【正确答案】 C
【答案解析】本题考查定语从句。根据从句中的谓语动词has 确定先行词为increasedcompetition,从句中缺少主语,故选关系代词that,所以C 项为正确答案。