Statistics show that although consumption of low-calorie, alternative sweeteners has gone up in each of the past five years, so has the percentage of the population that is obese. According to sugar manufacturers, this shows that the low-calorie, alternative sweeteners are not effective weight loss aids.
Which of the following assertions, if true, would most weaken the sugar manufacturers' conclusion?
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AMany people who use low-calorie, alternative sweeteners eat some foods that are not low- calorie.
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BSome low-calorie, alternative sweeteners can increase the appetite, making a person eat more than he or she normally would.
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CMany people use low-calorie, alternative sweeteners to accompany a well-balanced, low-calorie diet.
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DObesity has declined among people who have consistently used low-calorie, alternative sweeteners.
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EThe rise in the consumption of low-calorie, alternative sweeteners is primarily due to an increase in the number of users rather than an increase in the amount each user consumes.
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正确答案: D