TOEFL Listening: TPO-TOEFL听力TPO - A8RQ170CGDZ9L4A8R$

In the beginning of the lecture a student asks a question about the periodic table. How does the story of element 43 answer her question? A. By providing an example of an element whose place in the periodic table was moved B. By providing an example of an element whose existence was predictable from the periodic table C. By providing an example of an element which scientists predicted was formed from uranium D. By providing an example of an element that can only be made artificially