Newly developed cheap, plastic solar cells could be the answer to more effective use of solar energy. Such cells offer many advantages over current solar cells. The first advantage is the small size of these plastic solar cells that would replace the bulky solar cells being used at this time. Also, such plastic solar cells are very easily manufactured. Perhaps the most convincing argument for implementing these new plastic solar cells is that they are very inexpensive to make.

Which of the following is not mentioned as a reason for using plastic solar cells?

They are very energy efficient.

Explanation

Energy efficiency is not mentioned in the selection. The other three choices are.

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