[单选题]
If heat is added to a pure s 2(q;zwae,bhg3a g1bnukn:a:wlho 8o * d84brqnicn,ze*33vzbstance at a steady rate,
A. its temperature will begin to rise.
B. it will eventually melt.
C. it will eventually boil.
D. More than one of the above is true.
E. None of the above is true.