Jola has four candles. Each of her candles burns itself our within three hours. Jola lit two candles and placed them next to an open window. $$30$$ minutes later the wind blew out one candle, and another hour later the wind blew out another candle. Then Jola closed the window and lit all four candles. How long after this moment will the last candle burn out? 
选项为:A:$$1\text{ hr }30\text{ min}$$  B:$$2\text{ hr}$$  C:$$3\text{ hr}$$  D:$$7\text{ hr }30\text{ min}$$  E:$$8\text{ hr}$$  请回答其中一个选项.