原句中的NO是强调词么?

 OG242.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 one percent of the nation's energy needs.
(A) that no less than a technical or scientific breakthrough is necessary
(B) that nothing other than a technical or scientific breakthrough is needed
(C) that a technical or scientific breakthrough is necessary
(D) the necessity for an occurrence of a technical or scientific breakthrough

答案为C

NO算强调词么?NO LESS THAN和 NOTHING OTHER THAN是不是也是必错选项啊