Correct Answer is: (a, b, c, & d)
The molar heat capacity has the general definition
C = 1/n . ΔQ/ΔT ,
where n = number of moles, ΔQ = heat absorbed by the gas and ΔT = rise in temperature of gas.
It is possible to obtain almost any set of values for ΔQ and ΔT by proper selection of a process.