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阅读理解：
The potato is also from the New World. Around 1600,the Spanish brought it from Peru to Europe,where it soon was widely grown. Ireland became so dependent on it that thousands of Irish people starved when the crop failed during the"Potato Famine（饥荒）"of 1845～1846,and thousands more were forced to leave their homeland and move to America.
Thousands of Irish people starved during the “Potato 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.
正确答案：D
答案解析：本段提到，土豆传到欧洲后被广泛种植。爱尔兰人对土豆非常依靠。在“土豆饥荒”时期，土豆减产（when the crop failed），因而人们遭受饥饿，被迫离开故土。
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