Kitty writes down a sequence of five integers. The rule she uses is, "after the first two terms, each term is the sum of the two previous terms." She sequence is~\uline{~~~~~~~~~~}~,~\uline{~~~~~~~~~~}~,~\uline{~~~~~~~~~~}~, $$18$$, $$29$$.  What is her first term? ． 
选项为:A:$$0 $$  B:$$ 3 $$  C:$$ 4 $$  D:$$ 5 $$  E:$$ 7$$  请回答其中一个选项.