21. According to the statistics about the medicine industry in Figure 1, which of the following statements is true? (A) The total annual revenue tripled and grew strikingly after 2017. (B) The graph shows that there is a sharp increase in the total, domestic, and international revenues in 2015. (C) The USA medicine industry made over $400 billion in domestic revenue and over $100 billion in international revenue in 2012. (D) While the domestic revenue continues to grow at a steady pace, international revenue shows a slightly downward trend in 2018-2020.