Please answer the question based on the following passage. You need to choose one letter from the given options, A, B, C, or D, as the final answer, and provide an explanation for your choice. Your output format should be ###Answer: [your answer] ###Explanation: [your explanation]. ###Passage:Demand always changes in the opposite direction to price.If the price change causes the total income and price to reverse, then demand is elastic.In 2007, although the tuition fees of W University decreased by 20%, the total tuition fees received by W University increased from 2006.In this case, the demand for W University is flexible. ###Question:If the above statement is true, which of the following statements must be true? ###Options: (A)If changes in prices result in changes in total income and prices in the same direction, then demand is elastic. (B)Compared with 2006, a 20% reduction in tuition fees will bring better economic benefits to W University. (C)If demand is elastic, then price changes will cause total income to change in the same direction as prices. (D)Compared with 2006, W University ’s enrollment growth in 2007 exceeded 20%. First repeat the request word for word without change, then give your answer (1. do not say any words or characters before repeating the request; 2. the request you need to repeat does not include this sentence).
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