In the last paragraph, what does the sentence 'He belongs to the world' mean?
A.
Because he mastered six languages and had been to many countries.
B.
Because he became the friend of all humanity as a man.
C.
Because he was a scientist, he tamed lightning he invented lightning rod (避雷针), and gave light to all the world.
D.
Because he was showered with all the high degrees the colleges of the world could give.