Biologically speaking, hep c is smaller and simpler than A and B. This is one of the reasons why the body has a hard time recognizing it and vaccines haven't been developed. There is also a greater monetary incentive for drug companies to develop treatments rather than vaccines.
A hepatitis C vaccine, a vaccine capable of protecting against hepatitis C, is not available. Although vaccines exist for hepatitis A and hepatitis B, development of a hepatitis C vaccine has presented challenges. No vaccine is currently available, but several vaccines are currently under development