When calculating $63\times72$ , Judy fails to write the correct column multiplication. She writes one of the four digits as $9$ and gets a result which has a difference of $432$ from the correct one. Which digit does she write incorrectly? 
选项为:A:$$2$$  B:$$3$$  C:$$6$$  D:$$7$$  E:It\textquotesingle s impossible to determine.  请回答其中一个选项.