Nhận biết (M1)

The olona shrub is one of many forest plant species native to Oahu (a Hawaiian island) that are at risk of extinction. The survival of most of these species in the wild largely depends on birds eating their fruits and then dropping the seeds in different locations. Although Oahu's native fruit-eating birds have all gone extinct, the common waxbill and other fruit-eating bird species have been brought to the island and are now common there. Studies confirm that these non-native birds are spreading plant seeds on Oahu, suggesting that the birds __________

Which choice most logically completes the text?

• A.

  are dropping higher numbers of native forest plant seeds around the island than native bird species did in the past.

• B.

  show significantly more interest in eating the fruits of native forest plants than in eating the fruits of non-native ones.

• C.

  may be necessary for the continued survival of vulnerable forest plant species such as the olona shrub.

• D.

  may also engage in other activities that affect the ability of olona shrubs and other vulnerable forest plants to continue to spread to new areas.