Based on the phase diagram shown below, how will the melting point of the substance change if the pressure is increased above 1 atm? 
A) The melting point will decrease.
B) The melting point will remain the same.
C) The melting point will increase.
D) The substance will not melt at pressures of 1 atm and above; instead, the solid sublimes to form the gas phase.
Correct Answer:
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