For bolded statement question the key is to first look for keywords and opinion phrases (ignore the content of the argument and its strengths or weaknesses as much as possible). Usually, this is enough to characterize each of the bold sections in one of four ways: Author's conclusion, author's evidence, other's conclusion, or other's evidence. It's also important to notice (again keywords and opinion phrases are likely all you need) any agreement or disagreement. Finally, you can expect that the biggest clues are in the non-bold sections.
here, if we cut everything but the keywords and opinion phrases out we get:
If,
as some heirloom farmers believe,
bold bold bold bold bold then by _____________________________,
bold bold bold bold bold.
However, ____
should_____________________: __________________________________.
The first bolded bit is preceded by the opinion phrase
some heirloom farmers believe, so we know it is part of a non-author argument. And the first bold bit is followed by the conclusion keyword then; we know that what comes after
then will be a conclusion and what comes before will be evidence of some kind.
So we can characterize the first bolded section as non-author evidence.
The second bolded statement is still in the non-author voice (it's still connected to 'some believe'). But it follows the conclusion keyword
then.
So we can characterize the second bold bit as a non-author conclusion.
After the second bolded bit we finally get the author's voice (should) and we know it goes against the other guys (However).
D is the only answer choice that characterize both bolded bits as parts of a non-author arg, with the first being evidence and the second being conclusion.
Wrong answers:
Answers A and B and E can be eliminated because they imply that at least one of the bolded statements is part of the author's argument.
C mischaracterizes the second bolded bit as evidence (background on which the position is based) and not conclusion.