Marlene Zuk's Work on Field Crickets of the Hawaiian Islands

Marlene Zuk's work on field crickets of the Hawaiian islands has shed much light on how natural selection can operate in the wild over short periods of time. Which of the following phrases best describes Zuk's primary findings?

A) Parasitic flies killed all of the field crickets on the island of Kauai.
B) Parasitic flies exerted strong selection on wing morphology of the field crickets, rendering them incapable of producing song.
C) Parasitic flies ate the wings of field crickets on the island of Kauai, rending the crickets incapable of producing song.
D) Parasitic flies exerted strong selection on wing morphology of the field crickets, making them produce more elaborate song.
E) There was no significant relationship between parasitic flies and any characteristic of the field crickets.