Five years ago, Rigatani Corp. introduced its new energy drink, Energize. According to recent market surveys, the product is in its decline stage. At...

Five years ago, Rigatani Corp. introduced its new energy drink, Energize. According to recent market surveys, the product is in its decline stage. At the same time Energize was introduced, Panne Inc. introduced White Unicorn, another new energy drink. Therefore, White Unicorn must also be in its decline stage now.​

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Which of the following is an assumption on which the conclusion is based?