词汇精练——discrete

By such ingenious adaptations to specific pollinators, orchids have avoided the hazards of rampant crossbreeding in the wild, assuring the survival of species as discrete identities. At the same time they have made themselves irresistible to collectors.
The word "discrete" is closest in meaning to which of following?
(A) complicated
(B) separate
(C) inoffensive
(D) functional
 

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