Orwell used evidence to support the underlined claim in that D. He gives an example of two phrases that lost popularity with writers.
In the excerpt, the author made the claim that some aspects of language can be eliminated by the conscious efforts of some people.
To support his claim, he cited an example of how the phrases; "explore every avenue" and "leave no stone unturned" were killed by the jeers of some writers.
So, this proved that through the actions of a minority, some aspects of language can be eliminated.
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