In Many Wetlands, Nonnative Purple Loosestrife Has Become the Dominant

In many wetlands, nonnative purple loosestrife has become the dominant plant species, often accounting for 90% of the total plant mass. The populations of cattails, canvasback ducks, and bog turtles have decreased in areas with purple loosestrife.
-Purple loosestrife are a(n)

A) exotic species.
B) native species.
C) consumer.
D) parasite.
E) beneficial species.