C) They create a similar wake to that of ibises.
At the beginning of the fifth paragraph, the passage states that “the findings probably apply to other long-winged birds such as pelicans, storks and geese, says Usherwood. Smaller birds make more complex wakes that would make it too difficult to design.” So in these lines, the author suggests that unlike smaller birds, pelicans, storks and geese flying in a V formation probably make a wake similar to the ibis.
Choice A is incorrect because the passage focuses exclusively on the flight of birds, not on communication with birds. Choices B and D are incorrect because the passage discusses pelicans, storks, and geese only in terms of their migratory behavior, not their migration routes or how much energy they can expend in flight.
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