题目内容
（请给出正确答案）
[单选题]
Personal development can be defined as:（）
A.Being happy
B.Being educated
C.Being successful
D.Improving yourself
E.Being promoted in your job
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A:He is the first philosopher to write a book in the West.
B:He invented the Western scientific method.
C:He claimed that he didn’t know anything but could only ask questions.
D:He started a new religion.
