Even their most ardent champions concede that no less than a technical or scientific breakthrough is necessary before solar cells can meet the goal of providing on percent of the nation's energy needs.
A.
B. that nothing other than a technical or scientific breakthrough is needed
C. that a technical or scientific breakthrough is necessary
A和B哪里错了。另外，no less than有强调的意思，不应该在选项中保留下来吗？
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