The question is asking for inference or conclusion which is 100% confirmed by the passage.
(A) Winslow is correct about the preference of newspaper editors for controversial articles.
True. Winslow's claim ("preference for "
daring" articles that "
challenge" prevailing political positions) is confirmed to be true by the commentator ( It is
true that editors like to run antienvironmental pieces mainly because they seem to challenge the political orthodoxy)
(B) Critics of environmentalism have not successfully promoted themselves as renegades.
False: the opposite is mentioned: "antienvironmentalists .. may have
succeeded in selling themselves as renegades
(C) Winslow’s explanation is not consonant with the frequency with which critiques of environmentalism are published.
Not mentioned: The commentator stated that the articles have regular frequency, but Winslow didn't comment on the frequency. Winslow commented on the reason behind the writing only.
(D) The position attacked by critics of environmentalism is actually the prevailing political position.
Not confirmed: Winslow stated "
seem ... prevailing political positions", throwing doubt and uncertainty.
(E) Serious environmentalism will eventually become a prevailing political position.
False: The commentator clearly declined that claim : "serious environmentalism is
by no means politically orthodox"