2. Part A: What central idea about mathematical instruction does the author express in Passage 1? (R.2.2) A. Classrooms that foster laughter, discussion, and disagreement are linked to higher student performance. B. Opportunities for students to solve real-world mathematical problems can be a powerful approach to learning. C. New technological tools require a re-examination of the effectiveness of mathematical teaching methods. D. Due to the different learning styles of today’s students, teachers must use a variety of instructional methods.