The pronoun "they" (Line 4, Par()A．1) refers to " ()."

A．Textbook writers are usually better informed in their subjects.
B．Textbook writers are more objective than other types of writers.
C．Editorials aim at sharing facts with the readers.
D．All magazine articles have the aim to share opinions with the readers.

A．people's greater concern about public health care
B．old people's increasing interests in high-tech goods
C．more crimes being committed by senior citizens
D．communities' growing overlook of education