A community of farmers share a field. One farmer gets several new cows because the field is so large. In time, the field is over-grazed and diminishes in quality is called Introduction of invasive species.
An invasive species does not have to come from another country. For example, lake trout are aboriginal to the Great Lakes, but are considered to be an invasive species in Yellowstone Lake in Wyoming because they whole with native cutthroat trout for habitat.
Thus, option "A" is correct, Introduction of invasive species.
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