The correct answer is C. Invasive species.
Step-by-step explanation
In biology, invasive species is a term used to refer to some species of plants, animals, insects, and other organisms that are introduced into another ecosystem different from their original ecosystem, which leads to the overproduction of the invasive species, extinction of other species, among others as ecosystems lost balance. The brown tree snake is an example of an invasive species because after the Second World War was introduced in east Asia exactly in Guam, causing the extinction of many birds species in this region. So, the correct answer is C. Invasive species.