Explanation:Inference questions on the GMAT ask you to draw a logical conclusion based on the information provided. The correct answer is not directly stated in the passage, but it is supported by the evidence.
Let's analyze the answer options:
A) This is a reversal of the cause and effect presented in the passage. The passage states that high consumption of sugary snacks leads to energy crashes, not that energy crashes lead to high consumption.
B) The passage does not provide enough information to infer that consuming fruits and vegetables prevents energy crashes; it only states that the high-sugar group was less likely to consume these foods.
C) This is the correct answer. The passage indicates that the group who consumed the most sugary snacks also consumed fewer fruits and vegetables. This suggests a relationship between a high-sugar diet and decreased consumption of nutritious foods.
D) The passage states that the high-sugar group reported more fatigue, but it does not imply that every teenager will have this experience.
E) The passage does not provide evidence to support that eliminating high-sugar snacks will completely eliminate fatigue.
For inference questions, it's important to choose an answer that is a safe, conservative conclusion that is directly supported by the text. Answer C is the best choice because it is a logical deduction from the information given—that teenagers eating more sugary snacks also tend to eat fewer fruits and vegetables—without making broader claims that are unsupported by the passage.