The topic with which the article is concerned is （）

A．Vegetables and fruits with essential vitamins and minerals.
B．Foods grown in soil rich in organic matter.
C．Poultry fed in free pastures.
D．chickens raised on battery farms.

A．they are getting fired of processed foods
B．they want to change their eating habits
C．a lot of the foods they eat is not healthy
D．food experts recommend them to have natural foods