TOEFL Reading: ETS-TOEFL阅读机经 - UGE1833FBX5MZ4B3L$

In paragraph 4, what point is the author making about the particular species of mint, lily and nightshade found in Hawaii? A. These species have close relatives that, because they produce dry seeds, are unable to grow in the Hawaiian Islands. B. If these species did not produce edible fruits, they probably would not have succeeded in reaching the islands. C. These species, in addition to Hawaii's blueberry and sandalwood, provide further examples of fruiting plants that now grow in Hawaii but that are not native to the islands. D. These species have close relatives in the Hawaiian Islands that are able to attract birds without producing fleshy fruit.