Heat is added to a 1.0-kg solid sample of a material at -200 °C. The figure shows the temperature of the material as a function of the heat added. 
-Which one of the following statements concerning this substance is true?
A) It boils at 300 °C.
B) It melts at -200 °C.
C) It is a liquid at 200 °C.
D) It can coexist as a solid and a liquid at -50 °C.
E) It can exist as a solid, liquid, and gas at 150 °C.
Correct Answer:
Verified
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