The author mentions the estimates of "One writer"(line 22) primarily in order to

medasmx@protonmail.com on March 15, 2022

why not E

A and E seem similar. E looks like an example of the calculation which appears to be what is happening in the passage

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Emil-Kunkin on March 16, 2022

Hi Medas

While E does look tempting, I think that the author does not actually show how the size of an effective tax can be calculated. The sentence in question gives us the final output of the calculations, but does not go into any detail about how those calculations were made. While A does not look particularly strong, the sentence in question does provide an example of how large a tax would have to be in order to be effective.