Nhận biết (M1)

Domesticated thousands of years ago in South America, the chili pepper diverges in structure from its wild progenitors. In the case of maize (corn), another crop domesticated in the Americas, its resemblance to any wild plant is not immediately apparent, but genetic research has recently __________ the hypothesis that its ancestor is the teosinte grass.

Which choice completes the text with the most logical and precise word or phrase?

• A.

  unravel

• B.

  circumscribe

• C.

  embolden

• D.

  corroborate