种子传播方式的词汇表达 — 英语选择题

小林记录了四种种子的样子：甲种子很轻，绒毛像小伞；乙种子有能漂浮的外壳；丙种子表面有小钩；丁种子又圆又重，会落在母株附近。哪一组依次写出了甲、乙、丙、丁的传播方式？A. by wind, by water, by animals, by dropping B. by water, by wind, by dropping, by animals C. by wind, by animals, by water, by dropping D. by dropping, by water, by wind, by animals