According to the passage, which of the following has changed the most in the last 500 years

A．they were so dependent on potatoes that they refused to eat anything else
B．they were forced to leave their homeland and move to North America
C．the weather conditions in Ireland were not suitable for growing potatoes
D．the potato harvest was bad

A．life for a child is comparatively easy
B．a child is always loved no matter what he does
C．if much is given to a child, he must do something in return
D．only children are interested in life