What must be done in relation to contracts involving an interest in land? a) Contracts involving an interest in land require double the standard consideration for a valid contract. b) Contracts involving an interest in land are covered by the statute of frauds, and as such, must be in writing. c) Contracts involving an interest in land require that the transaction be registered with the federal court. d) Contracts involving an interest in land require parties to the contract be registered to vote.