By saying "the world has been spared a t.rue water war" (Line 1, Para.4), the aut

Bysaying"theworldhasbeensparedat.ruewaterwar"(Line1,Para.4),theauthormeans（）

[A]thewatersupplyintheworldismorethanneeded

[B]theworldhassavedenoughwatertoavoidthewar

[C]theworldhasneversufferedawartr iggeredbywater

[D]theworldsparesnoefforttoavoidawarcausedbywater