根据短文内容，从每小题A、B、C三个选项中选出一个最佳答案。
Long ago, a farmer, hard-working, had a wonderful olive orchard(橄榄园). Unluckily, his three sons cared less about his olive orchard. They couldn't wait to be wealthy in a short time.
When the farmer was old, and felt that his time had come to die, he called the three sons to him and said, "My sons, there is a pot of gold hidden in the olive orchard. Dig for it, if you wish it."
The sons tried to get him to tell them in what part of the orchard the gold was hidden, but he would tell them nothing more.
After the farmer was dead, the sons went to work to find the pot of gold. Since they did not know where it was, they agreed to begin in a line at one end of the orchard, and to dig until one of them should find the money.
They dug until they had turned up the soil from one end of the orchard to the other, round the tree-roots and between them. But no pot of gold was to be found. The three sons were disappointed to have all their work for nothing.
The next olive season, the olive trees in the orchard bore more fruit than they had ever given. When it was sold, it gave the sons a whole pot of gold.
And when they saw how much money had come from the orchard, they suddenly understood what the wise father had meant when he said, "There is gold hidden in the orchard. Dig for it, if you wish it."
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