TOEFL Listening: TPO-TOEFL听力TPO - 14U75JF064H87J3VR$

What does the professor imply about the various techniques used to view Archimedes' text? A. The students should be familiar with most of the techniques. B. Different techniques were used to analyze the iron content of ancient ink. C. The use of ultraviolet light was more damaging than the other techniques. D. X-ray image was more effective than the other techniques.