It’s D
She care for the mentally ill.
The answer would be “ The Huns attacked more than seventy cities throughout the empire “
The meaning of this quote "A leader is best when people barely know he exists; when his work is done, his aim fulfilled, they will say; we did it ourselves" means if the leader is unknown to many people once he has finished or achieved a remarkable goal other people (such as Laozi) can steal the glory and be remembered for something they didn't do.
The reason is very simple - profit.
The rabbits were not worth much to the Europeans, but were to the Aztecs, but the cocoa beans for the Europeans were like gold. They were a very attractive exotic product from which unique and unseen things were made. In the European market the cocoa beans had enormous price, and the demand for it was very high especially from the aristocracy which loved it and didn't speared money for it.
The resignation of President Nixon ended a chapter in the relationship of politicians and the media and began a new one.
Politicians were now much more hesitant around the media and the media saw a new role for themselves as investigators in a way not seen since the muckrackers.