(E) is incorrect because the passage never mentions the difference in transition temperature for different types of glass. (C) is correct because the passage tells us that to have slightly more than negligible ability to flow, the glass must be heated to at least 350 C (lines 41-43), and transition temperature is typically a range of a few hundred degrees (lines 14-16), meaning the upper limit at which glass turns into liquid is significantly higher than 350 C.