Engineering Thermodynamics
Relation between cp and cv is given by (where cp = Specific heat at constant pressure, cv = Specific heat at constant volume, γ = cp/cv, known as adiabatic index, and R = Gas constant)

cp - cv = R
cv/ cp =R
cv = R/ γ-1
Both (B) and (C)

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Engineering Thermodynamics
Extensive property of a system is one whose value

Is not dependent on the path followed but on the state
Depends on the mass of the system like volume
Is dependent on the path followed and not on the state
Does not depend on the mass of the system, like temperature, pressure, etc.

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