Andy writes down the largest two-digit prime such that each of its digits is prime.  Baker writes down the smallest three-digit prime such that each of its digits is prime.  Carl adds Andy\textquotesingle s number and Baker\textquotesingle s number.  What answer does Carl obtain? ． 
选项为:A:$$174 $$  B:$$185 $$  C:$$198 $$  D:$$209 $$  E:$$296$$  请回答其中一个选项.