【单选题】

According to the passage, it is believed that the largest extinction of a species occurred
A．( 26 million years ago

B．( 65 million years ago
C．( 225 million years ago
D．( 250 million years ago

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根据网考网移动考试中心的统计，该试题：

4%的考友选择了A选项

33%的考友选择了B选项

55%的考友选择了C选项

8%的考友选择了D选项

According to the passage, it is believed that the largest extinction of a species occurredA．( 26 million years ago