WHAT DOES THE PASSAGE MAINLY DISCUSS

25. - DE THI THU THPT MOONVN CUA CO MAI PHUONG CO DAP AN BAN WORD DE 2
DE THI THU THPT MOONVN CUA CO MAI PHUONG CO DAP AN BAN WORD DE 2
25. What does the passage mainly discuss? A. Causes of food spoilage B. Commercial production of ice C. Inventions that led to changes in the American diet D. Population movements in nineteenth century