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How to Become Cleverer

　　Once a boy came to ask a fisherman how to become cleverer, because his mother always called him “foolish boy”

　　“That’s easy,” answered the fisherm．an．“I know one way to make you become cleverer．”

　　“Really?”

　　“Of course．It is said a fish head is good for brain．If you eat one, you’ll become cleverer indeed．Pay only three pounds for one fish head．” The boy paid him three pounds and the fisherman cut off a fish head and handed it to him．

　　A raw fish head is not good－not even for a hungry boy to eat but the boy ate it up in two gulps．

　　“Do you feel anything?” asked the fisherman．

　　“Not in my head,” said the boy．

　　The boy lay on the ground and thought．“One whole fish costs only two pounds．I had paid him three pounds for the fish head．Why couldn’t I have the whole fish for soup, a head for brain and one pound left over?” He jumped up and shouted at the fisherman．“You thief! You are fooling me!” The fisherman laughed, saying, “The fish head works now, you see．”

根据短文内容，从A．B．C．D四个选项中选出能回答所提问题或完成所给句子的最佳答案。