In the experiment, which of the following observations would suggest that a solid sample is a mixture? The

A. solid can be ground to a fine powder
B. density of the solid is 2.25gdm^-3
C. solid begins to melt at 573k but is not completely melted until 648k  
D. solid absorbs moisture from the atmosphere and turns into liquid
E. solid melts at 300k

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Correct Answer: C