I'm not sure there would be any need - or any ability to bring - any civil action.
Forgery would appear to count as a Category D felony under Section 205.090 and, "In addition to any other penalty, the court shall order the person to pay restitution.", so person "a"'s damages should have been met under the process of the criminal prosecution of person "b" for forgery, with nothing further to claim.
Person "c" will have stolen a car. Whether that car was legitimately owned by person "a" may only be relevant if person "c" is using their belief that it belonged to person "b" as mitigation (for example recovery of a debt - though it won't help much as this should have been done through proper channels), which again would be a criminal proceeding.