The Phase Diagram for CO₂ Is Given Below $\degree$ C and 25 Atm Is Suddenly Brought to 1 Atm

The phase diagram for CO₂ is given below.The triple point is at 5.1 atm and 217 K. What happens if carbon dioxide at -50 $\degree$ C and 25 atm is suddenly brought to 1 atm?

A) The liquid and solid are in equilibrium.
B) The solid melts.
C) The solid and vapor are in equilibrium.
D) The solid vaporizes.
E) The solid remains stable.