How does the author's use of both problem/solution and compare and-contrast structures in paragraph 3 support the central idea? A. It compares the different ways museums waste money and presents solutions for curbing this waste. B. It compares museums educational programs and explains why they are a financial burden. C. It compares the ways museums make money and says higher admission fees are the main solution. D. It compares museums different income generators and the limitations each one presents.