The author mentions the Nile perch in order to provide an example of

HannahNg on April 23, 2020

Why not A

It seems like just an example of a species going extinction through human activity.

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SamA on April 26, 2020

Hello @HannahNg,

This is kind of a tricky question. Why did the author discuss the Nile perch? Is the Nile perch an example of an extinct species? No, because it is not extinct! Rather, it was carelessly introduced to a new habitat, where it is a threat to other species. Take a closer look at the sentence starting on line 38.

This is still the fault of humans, so B is the correct answer.