The length of Amy\textquotesingle s string is $$35\text{cm}$$. The length of David\textquotesingle s string is $$29\text{cm}$$. What is the total length of both strings? 
选项为:A:$$54\text{cm}$$  B:$$49\text{cm}$$  C:$$64\text{cm}$$  D:$$65\text{cm}$$  E:$$66\text{cm}$$  请回答其中一个选项.