Cassie is giving a speech about the rising cost of higher education. In her first main point, she talks about how high the cost of a college education has become and explains why this has made college unattainable for many students. In her second main point, she talks about the reasons that college has become so expensive. In her third main point, she provides recommendations for reducing the cost of a college education and making it accessible for all students. Which pattern of organization is Cassie using?