Sam, a plumber, entered into a contract for $$75,000$ with Orr, Inc., to perform certain plumbing services in a building owned by Orr. After Sam had satisfactorily performed the work, Orr discovered that Sam had violated the state licensing statute by failing to obtain a plumbing license. The licensing statute was enacted merely to raise revenue for the state. As an independent appraisal of Sam's work indicated that the building's fair market value increased by $$70,000$ as a result of Sam's work. The cost of the materials which Sam supplied as $$35,000.$ If Sam sues Orr, Sam will be entitled to recover

a$.$

$$0$

b$.$

$$35,000$

c$.$

$$70,000$

d$.$

$$75,000$