When the book reviewer discusses the book The Joy of Laziness, he is ______.

A．fewer free radicals may slow down one's metabolism.
B．high energy activities may cause more diseases.
C．too much exercise may impair one's organs.
D．the feeling of stress may weaken one's immunity.

A．is a latest best Seller.
B．clicks with young people.
C．caters to people's psychological needs.
D．might damage people's lives.