How will the right answer fit in terms of support and conclusion?

Only the right answer will accurately call out why this support doesn’t establish this conclusion

Highlight the main conclusion in the passage, if there is one:

we would spend about a billion dollars less on these ozone-related health costs should the proposed measures be adopted.

[SUPPORT]. Since [SUPPORT], [CONCLUSION].

Map the wording of the answers to the wording of the passage:

(A) …other types of pollution not involving ozone…

Stop. The conclusion is only about “ozone-related health costs”, and it’s the only type of pollution mentioned in the support too. So “other types” doesn’t map to anything the author said, and not considering that doesn’t impact their argument.

(B) …vary roughly in proportion to ozone levels

That specifically means they go up and down by the same percent. Does that map to the author’s argument? You bet. They said the ozone levels would be “one fifth lower”, and they said the health costs would go down by about one out of five billion dollars. This is about as math-y as the LSAT gets, so don’t worry too much. But we have no way of knowing that every drop in ozone leads to the same drop in costs, so this is a legit flaw in the argument.

(C) …the proposed air pollution measures will in fact be adopted

The passage says “If” they’re implemented, and the conclusion says “we would spend”, so the author isn’t assuming the measures will pass, and giving an “explicit reason” isn’t relevant to their conclusion about the hypothetical savings.

(D) …by making an appeal to emotions

Hahaha what?! The argument is about saving money, so I hope we’ll all agree there’s clearly no appeal to emotions in there.

(E) …in order to draw attention away from more significant…

Nobody picked this, right? If you did, you’re misunderstanding what the test is asking you. We don’t even know if there are “more significant sources” of costs, since ozone is the only one mentioned. You’d have to assume those exist, which you’re not supposed to do.

(B) is the correct answer.