The correct response is B: by describing the consequences of not appreciating boundaries.
In paragraphs 6 through 8, the author discusses how failing to respect teenagers' privacy can lead to a breakdown of trust between parents and children. It also touches upon the idea that if teenagers feel that their parents do not appreciate their boundaries, they may resort to hiding information from them, which suggests that not having established boundaries can lead to dishonesty. This development supports the implied idea that teens may become dishonest if they do not have privacy at home.