A Sample Consisting of CO₂(g) and CO₂(s) at Equilibrium at -78°C

A sample consisting of CO₂(g) and CO₂(s) at equilibrium at -78°C and 1 atm pressure is heated to -30°C, and the pressure is increased to 8 atm. Based on the phase diagram below, what will happen?

A) At equilibrium, only CO₂(g) will be present.
B) The melting point of the CO₂(s) will decrease.
C) At equilibrium, CO₂(g) and CO₂(l) will be present.
D) All the CO₂ will be converted to CO₂(l) .
E) none of these