Steam at 4 MPa and 400°C Is Throttled Adiabatically to a Pressure

Steam at 4 MPa and 400°C is throttled adiabatically to a pressure of 1 MPa. If the change in kinetic energy is negligible, the specific volume of the steam after throttling will be

A) 0.2952 m³/kg
B) 0.2327 m³/kg
C) 0.3749 m³/kg
D) 0.5165 m³/kg
E) 0.3066 m³/kg