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【单选题】
Read the following passage and identify the problem in the causal reasoning. Oranges to combat the blues. Researchers have recently revealed that eating two oranges a day can help alleviate depression. Researchers studied 13 patients who had feelings of depression. After three weeks of eating two oranges a day, 9 of the 13 people reported improvement in their condition. The researchers hypothesize （假设）that the citric acid and vitamin C in oranges help to stimulate serotonin (血清素) production helping to combat depression.
A.
Eating oranges is not the only reason for combating depression. There are many other obvious alternative explanations.
B.
There is no correlation between eating oranges and alleviating depression.
C.
Some patients who reported improvement in depression concealed their real physical condition.
D.
It’s hard to justify the sequence of eating oranges and relieving depression.
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参考解析：
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