In the third paragraph, "two continents' refer to ______.

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.

A．Franklin did great contributions to the world, especially to America
B．Franklin was kind so he was duped by a false friend as a boy
C．Franklin lived a hard life when he was young
D．Franklin became world famous through hard work