问题详情

Thouands of Irish people starved during the "Porto Famine" because.
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 America.
C．the weather conditions in Ireland were not suitable for growing potatoes.
D．the potato harvest was bad. 请帮忙给出正确答案和分析，谢谢！