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I couldn't understand why I got this wrong until I started writing this, so I figured I'd publish just in case it helps others.
Decrease in revenues > Prices risen beyond what people can afford > Salaries not kept pace.
Contrapositive: Salaries kept pace > Prices do not rise beyond level people can afford > No decrease in revenue
Question: If salaries have kept pace during last year, what MBT?
(B) Incorrect: Retail stores will not experience a drop in retail sales this holiday season
(C) Correct: Prices in retail stores have not risen beyond the level that most people can afford during this holiday season.