number of people who have access to private cars is on increase in recent years.AA

问题补充：

number of people, who have access to private cars, is on increase in recent years.

AA ; the

BA; an

C. The ; the

D. The ; /

答案：

A. A ; the

B. A; an

(答案→)C. The ; the

D. The ; /

解析：考查冠词的用法。anumber of许多，大量；the number of......的数量。句意：近年来，拥有私家车的人的数量在上升。根据句意可知，这里指“......的数量”，排除A、B；on the increase增长，提高。故选C。