In Neugebauer v. Neugebauer, the state Supreme Court held that the sale of the family farm from the mother to her son Select one: a. was void on the grounds of fraud in the inducement. b. was unenforceable on the grounds of violating the real estate licensing statute since Lincoln failed to maintain such a license. c. was voidable on the grounds of undue influence. d. was voidable on the grounds of duress.