One of the central ideas of the excerpt is The Japanese art of shipbuilding is a difficult skill to learn (option C)
The fragment talks about the Japanese tradition of boat building. The author mentions that this tradition is millenary and has a high difficulty because it takes six years for apprentices to learn the basic skills and techniques to build wooden boats (option C).
On the other hand, he adds that the teaching of shipbuilding is a tradition that has not been transmitted generationally but that master builders often die without transmitting their knowledge to young people. Therefore, it is considered important to formalize training in this tradition so that knowledge is not lost.
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