题目内容：
Passage FourWhen Abraham Lincoln was a lawyer in rural Illinois， he and a certain judge in town once got to bantering with one another about horse trading. The upshot of the discussion was that they agreed that the next morning， at nine o'clock， they would meet in front of the general store and make a trade. Each would bring a horse， unseen by anyone up to that hour. If either backed out of the deal， he would forfeit $25. The money from each man was held by the local banker.
The next morning， at the appointed hour， the Judge， came up the dirt road， leading the sorriest looking specimen of a horse ever seen in those parts of Illinois. The large crowd viewing the spectacle burst out laughing， already knowing that Abe Lincoln was bound to get the worst of the deal. A poorer horse just couldn't exist anywhere and still be walking.
In a few minutes， however， Mr. Lincoln was seen approaching the general store carrying something quite large and bulky on his shoulders. As he drew nearer， the crowd saw what it was， and great shouts and laughter broke out. The shouts and laughter soon broke into a thunderous roar when Mr. Lincoln， looking carefully and seriously over the Judge's animal， set down his sawhorse （锯木架） ， and exclaimed， "Well， Judge， this is the first time I ever got the worst of it in a horse trade. "
This passage concerns A．the life of Abe Lincoln
B．a horse trade made by Abe Lincoln
C．a gambling in Illinois
D．Abe Lincoln's philosophy
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