Refrigerant 134a Enters a Diffuser Steadily at 0

Refrigerant 134a enters a diffuser steadily at 0.5 MPa, 50°C, and 120 m/s at a rate of 1.2 kg/s. The inlet area of the diffuser is

A) 0.81 cm²
B) 4.8 cm²
C) 26 cm²
D) 5.3 cm²
E) 100 cm²