In this scenario, ”B” has breached the contract by refusing to execute the sale deed despite receiving the advance payment. ”A” can file a suit for specific performance to compel ”B” to fulfill her contractual obligations. Specific performance is a remedy in contract law where the court orders a party to perform their obligations under the contract. Therefore, ”A” should file a suit for specific performance in the civil court having the powers under the Civil Procedure Code, 1908.