问答题

Although a number of inventions not only change society but also bring the inventor enormous pride and even paychecks, some fizzle out because they just do not succeed as hoped. In fact, even the most famous inventors encounter some failed concepts. One of the world’s most prestigious inventors, Thomas Alva Edison, creator of the light bulb and the phonograph, tried to introduce the idea of cabinets and other furniture made out of concrete. This furniture was too heavy and too expensive to ever become popular, thus proving that nobody is always right.

Select the sentence within the paragraph that describes why sales of Edison’s concrete furniture turned out to be unsuccessful.

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