Water at 400 kPa with a quality of 75% has its pressure raised by 200 kPa in a constant-volume process. What is the new state (x, T)? At what pressure will the water go into the single-phase region?

A. State: Liquid, Pressure: 600 kPa
B. State: Saturated Vapor, Pressure: 600 kPa
C. State: Saturated Liquid, Pressure: 800 kPa
D. State: Superheated Vapor, Pressure: 600 kPa