Multiple Choice Question

In which sentence from paragraph 3 of "Young People Can Watch Television Wisely" is the main idea of the text FIRST introduced?

A.
Some argue that the time young people spend watching television could be better used doing almost anything else.

B.
However, these people don’t seem to realize that many shows are educational.

C.
Nature shows, documentaries, and science programs can teach young people about animal species, other cultures, or even the laws of physics.

D.
Learning about something new, regardless of how it is done, is never time wasted.

The main idea of the text is FIRST introduced in sentence A: "Some argue that the time young people spend watching television could be better used doing almost anything else."