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D)にはbyがないので×にしたのですが、これが正解でした。何故byなしでもこの文は成立するのでしょうか？どなたか教えて下さい。
Scientists believe that unlike the males of most species of moth, the male whistling moths of Nambung, Australia, call female moths to them <by the use of accoustical signals, but not olfactory ones, and they attract> their mates during the day, rather than at night.
D)using acoustical signals, rather than olfactory ones, and attract
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