For the process dry ice $\rightarrow CO_{2(g)}$,which of the following is true regarding the thermodynamic parameters?

• A
  $\Delta H$ is positive while $\Delta S$ is negative
• B
  Both $\Delta H$ and $\Delta S$ are negative
• C
  Both $\Delta H$ and $\Delta S$ are positive
• D
  $\Delta H$ is negative while $\Delta S$ are positive