Question ID:PT46 S2 Q7 Passage:Although instinct enables organisms to make complex responses to stimuli, instinctual behavior involves no reasoning and requires far fewer nerve cells than does noninstinctual (also called flexible) behavior. A brain mechanism capable of flexible behavior must have a large number of neurons, and no insect brain has yet reached a size capable of providing a sufficiently large number of neurons. Stem:Which one of the following can be properly inferred from the statements above? Correct Answer Choice:BChoice A:The behavior of organisms with elaborate brain mechanisms is usually not instinctual. Choice B:Insect behavior is exclusively instinctual. Choice C:All organisms with brains larger than insects' brains are capable of some measure of flexible behavior. Choice D:All organisms with large brains are biologically equipped for flexible behavior. Choice E:Only organisms with brains of insect size or smaller engage in purely instinctual behavior.