Pressurized Feedwater in a Steam Power Plant Is to Be

Pressurized feedwater in a steam power plant is to be heated in an ideal open feedwater heater that operates at a pressure of 0.5 MPa with steam extracted from the turbine. If the enthalpy of feedwater is 215 kJ/kg and the enthalpy of extracted steam is 2442 kJ/kg, the mass fraction of steam extracted from the turbine is

A) 5%
B) 10%
C) 19%
D) 9%
E) 29%