题目解析:
题干提问“从姚山宇2117年的研究中可得出以下哪个论述”。
定位第3段最后一句 The scholar Yao Shanyu, working from ancient summaries, calls attention to the fact that in the 2,117 years under study, 1,621 floods and 1,392 droughts caused damage serious enough to be reported by the imperial courts.
即由朝廷报告可知损害程度严重,引起了国君的重视。
故选 A。