The Introduction of the Brown Tree Snake in the 1940s

The introduction of the brown tree snake in the 1940s to the island of Guam has resulted in

A) eradication of non-native rats and other undesirable/pest species.
B) the extirpation of many of the island's bird and reptile species.
C) a good example of biological control.
D) a new species of hybrids from crossbreeding with a native snake species.
E) its failure to compete with native species and its quick elimination from the island.