A rented out his house and courtyard facing the street to B, and B used it as an automobile repair shop. With A’s permission, B expanded, at his own expanses, several houses for automobile painting. When B was submitting an application to the authorities for expanding the building, he found that all the properties A rented out was not approved by the Urban Planning Department, meaning that all are unauthorized construction.Which of the following is true? A. The lease contract is invalid. B. A and B shall jointly bear the costs for expanded construction, because both are in fault in doing so. C. B can cancel the lease contract, because A did not inform B that the house is unauthorized construction. D. B can continue to perform the contract waiting for the relevant authorities to confirm that the house is unauthorized and affecting his use of the building, then he can claim for liability for breach of contract.