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------------------------------------------------ Old thermometers contained very small amounts of mercury. The mercury in the photo has a melting point of -38.8 degrees Celsius. What can you conclude about the melting point of the mercury in old thermometers?

A. Its melting point can only be determined when the mercury is burned.
B. Its melting point changes as the temperature of mercury changes.
C. Its melting point equals -38.8 degrees Celsius because it is mercury.
D. Its melting point is less than -38.8 degrees Celsius because its volume is smaller.