74 LR One Question 20
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So isn't B also a necessary assumption?
If the visitors coming don't spend money, e.g they all bring a bag lunch, then there will be no increase in tax revenue from all those free loading convention goers.
Isn't it a flaw in their argument that they have assumed, without offering evidence, that visitors = tax revenue? So don't I need to plug that hole first?
I understand how you arrived at your solution.
I have a tendency to get sufficient assumptions wrong because I select the conclusion of the argument rather than what is missing in the argument and my guess is this is what I have done here as well.
If that is what I have done then do you have any tips on how I avoid it?
"Isn't it a flaw in their argument that they have assumed, without offering evidence, that visitors = tax revenue?"
No; you can be certain it is not an assumption if it is present in the argument. A necessary assumption is evidence the argument needs, but does not have. The sentence you've asked about is evidence.
The cleanest way to deal with Sufficient Assumption questions is to say "This author believes [X] because of [Y]. To prove that claim, let's find an answer that says 'If [Y] happens, then [X] happens.'"