题目内容：
阅读下列短文，回答题。 It may be pointed out that warfare(战争)as practiced by mall has no parallel in nature．
This is to say that within the more highly developed animal populations of this earth，there is not now．norhas there been similar destruction within a species(物种)itself．In fact，one has to go to the lowliestforms of animal life．such as certain kinds of ants，to find anything comparable to human warfare．It isa curious fact that mankind appears to give the killing of his own kind a good reason by imaging thatit is a“law of nature”．There are now a lot of wrong ideas about the laws of nature，of which this isone of the most incorrect and fateful(致命的)．Political beliefs have been based upon it with resultsthat have come near to destroying human civilization．The theory that war is a biological necessity，that it is nature’s method of controlling population and believing in the survival(生存)of the strongand the elimination(灭亡)of the weak，is totally wrong and insupportable．Within the last centur．y，when wave been common all over the world，the human population of the earth has almost doubled．
The main idea of this passage is___________．． A．wadhre is a“law of nature’’
B．Waflare is not a‘‘law of nature’’
C．warfare does not control human population
D．none of the lowlier animals，except ants，practice warfare upon their own species
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