
Passage: There is a psychological theory that in order to be happy, one person must maintain a close relationship with another person. However, the world's greatest philosophers spent most of their lives alone and without close relationships. Therefore, this psychological theory must be wrong.
Question: Which of the followings must be assumed by the above conclusion?
A. A.The world's greatest philosophers prefer to avoid close relationships.
B. B.People with close relationships seldom spend their time alone.
C. C.Solitude is necessary for philosophers to meditate.
D. D.The greatest philosophers in the world are happy.
Answer: