Answer is: D) non-indigenous species.
Non-indigenous species or an introduced species is a species living outside its native area, but which has arrived there by human activity, either deliberate or accidental.
Kudzu (Japanese arrowroot) was introduced from Japan into the United States at the Japanese pavilion in the 1876 Centennial Exposition in Philadelphia.
The United States Forest Service estimated the rate of spreading of plant Kudzu to be 2500 acres per year.