The author included the quotation "Air gets pretty unpredictable behind a flapping wing" to A) explain that the current created by a bird differs from that of an airplane.
Deductive reasoning can be defined as a type of logical reasoning that typically involves drawing conclusions based on a given set of rules and conditions, or from one or more premises (factual statements) that are assumed to be generally (universally) true.
An inference can be defined as a process through which a reader can deduce the meaning or message (information) that is associated with a subject matter in a literary work, especially through induction.
Based on the information provided in lines 17 - 18 of the passage, we can infer and logically deduce that the author included the quotation "Air gets pretty unpredictable behind a flapping wing" in order to explain that the current created by a bird is different from that of an airplane because it was written immediately after the statement that "currents created by airplanes are far more stable than the oscillating eddies coming off of a bird."
Read more on deductive reasoning here: https://brainly.com/question/860494
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