The correct answer is (d). None of the above.
Section 5 of the Transfer of Property Act deals with the transfer of property by a person who is not the owner. Section 6 deals with the transfer of property by a person who is the owner but does not have the power to transfer it. Section 7 deals with the transfer of property by a person who is the owner and has the power to transfer it, but the transfer is not valid for some reason.
None of these sections deals with the transfer of a mere right to sue. A mere right to sue is not a property right and cannot be transferred.