While income worry is _______ rather common problem of the aged, loneliness is another problem that ________ aged parents may face.

A．a; 不填

B．the; 不填

C．a; the

D．the; the

（）是幼儿园的法人代表、是幼儿园的负责人，对外代表幼儿园，要做对外协调工作。