All of the Following Statements About Thermostatic Expansion Vales on Retrofitted

All of the following statements about thermostatic expansion vales on retrofitted systems are true,EXCEPT:

A) The expansion valve does not have to be replaced when retrofitting a system from R-12 to R-134a.
B) If a defective expansion valve is replaced, always use a model designed for the system refrigerant.
C) A R-12 expansion valve used in an R-134a system will result in higher superheat and reduced evaporator efficiency.
D) An R-134a valve used in a R-12 system will have reduced superheat.