Why is D correct? Why is C incorrect?

@Ryan-Mahabir, (C) is incorrect because the passage tells us that the atomic structure of liquid and solid glass are the same but thermodynamically they are not the same (line 11-13), thus we cannot infer that liquid and solid glass behave the same. (D) is correct because the passage allows us to infer that glass transition temperature is a temperature range where solid/ hard glass starts to turn into liquid, thus it is likely to flow under its own weight.