What is the difference between sub-conclusion and minor conclusion? Is the only difference that minor conclusion does not also need to be a premise? Thank you!

For this question specifically, it helped me to summarize the overall principle of the stimulus in a couple of words and then to compare that summary to the answer choices to see which of the answer choices matches my summary the best. I summarized the stimulus by saying something like "if I am uncertain, then I should do the extra step just in case" and that led me to question A. This technique may help with the more "principle" based flaw questions.