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The argument's logic:
Rivals attract customers with lower prices + more variety → BrewMaster matches both → Customers return → Sales recover

Why D is wrong:
It's because of the word 'solely'

Ask yourself: if D is false, does the conclusion absolutely collapse?

Say 99% of the decline is because of rivals and 1% is because a nearby office closed. D is now technically false - the decline isn't solely due to rivals. But does the plan fail? Not at all, it still reverses nearly all the decline.

If negating an answer choice doesn't destroy the conclusion, it's not a necessary assumption.

Why B is correct:

Negate B: customers who left for rivals don't actually care about lower prices or more variety, they left for other reasons (ambiance, location, loyalty programs). Now BrewMaster's plan has zero mechanism to bring them back. The conclusion completely collapses.

Answer: B

Takeaway: For assumption questions, always apply the negation test strictly. If the conclusion can still stand, that choice is not a necessary assumption.

catcun
egmat could you please explain why D is incorrect?
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I think B is exactly like the premise, and an assumption should not be the premise
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Ngocvb10 Hi, can you please show where it is mentioned? So that I can help you in this question
Ngocvb10
I think B is exactly like the premise, and an assumption should not be the premise
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Hi, Ngocvb10,

There's a subtle difference between exactly and exactly like. An assumption, by definition, is an unstated premise, so it will be *like* a premise, sure, but not the same as a premise stated in the argument.

Hope this helps. Let me know if anything is unclear.

Ngocvb10
I think B is exactly like the premise, and an assumption should not be the premise
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