The author of Source 3 counters the argument regarding giant pandas by stating that they're beneficial to the ecosystem.
<h3>What is an argument?</h3>
It should be noted that an argument simply means the stance of an individual regarding an issue.
In this case, the author of Source 3 most clearly counter the argument in Source 1 that protecting giant pandas isn't appropriate by stating that they play an important role in the ecosystem.
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brainly.com/question/3775579
A noun is a person, place, or thing
I think A would be your best bet but im not 100% sure, space is a place and everyone I guess would be considered a person/people