Which of these would MOST LIKELY lead to a change in the ecosystem of a certain area?
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A)
A man decides to ride his bike to work instead of drive his car.
B)
A species of animal dies off because of air and water pollution.
A town opens a recycling center to turn old items into new ones.
D)
A business stops releasing chemicals into local rivers and streams.

correct answer is:

B) A species of animal dies off because of air and water pollution.

Explanation:

If a species of animal were to die off, then it would result in the growth of another species ( the one that animal fed off ), which would then cause another species to die out, resulting in food shortages for other animals.

In short, the food chain would be affected.

Hope I was able to help :)

it is an infinitive phrase with a subject.

so is this a rhetorical question?