The Following Questions Refer to the Phase Diagram Below

The following questions refer to the phase diagram below. Gas, liquid, and solid phases are all present, but not labeled.
-Starting at the temperature and pressure of b, if the temperature is increased at constant pressure, ultimately

A) the substance will sublime.
B) the substance will undergo fusion.
C) the substance will undergo deposition.
D) the substance will freeze.
E) the substance will be a supercritical fluid.