Through which of the following can't unhappiness come according to the author

A．If you want to get pleasure, you have to be rich.
B．If you are rich, you'll create for yourself unlimited fears and troubles and have a lot of trouble.
C．A poor but fearless person will feel more happiness than a rich one who has a lot of trouble.
D．Poorer people will acquire more pleasure than the rich.

A．We get greater discomfort over a period of time.
B．We are tortured by greater discomfort.
C．Greater discomfort exists in our body.
D．Greater discomfort makes us miserable.