34. Which statement best describes how the author's use of the sentence, "It was said to be a ferocious gurgling, like far-off armies of horses with sleigh bells" affects the reader? A. The sentence helps the reader understand why the passenger pigeon could not survive modern times. B. The sentence helps the reader understand why tree limbs tended to break under the weight of these large im birds. C. The sentence makes the reader regretful that the passenger pigeon is extinct. D. The sentence expresses how pervasive and most probably frightening the sound of the pigeons was.