Identify the main idea of the following paragraph and make the revision of it.According to Rachel Jones, Assistant Director of Housing Service, the initial purchase and installation of carpeting would cost $300 per room. Considering the number of rooms in the three residence halls, carpeting amounts to a substantial investment. Additionally, once the carpets are installed, the university would need to maintain them through the purchase of more vacuum cleaners and shampoo machines. This money would be better spent on other dorm improvements that would benefit more residents, such as expanded kitchen facilities and improved recreational space. Thus carpets would be too expensive.--The Allyn & Bacon Guide to Writing by Ramage, Bean & Johnson,2009, p. 528The topic sentence (main idea) is _____ of the paragraph.A. at the beginning B. at the end