In a fruit market, $$1\textasciitilde\text{kg}$$ of apples is priced at $$\textbackslash$a$$. $$1\textasciitilde\text{kg}$$ of strawberries costs $$\textbackslash$b$$ more than $$2$$ times $$a$$. How much will $$3\textasciitilde\text{kg}$$ of strawberries cost? 
选项为:A:$$3a+6b$$  B:$$2a+b$$  C:$$6a+3b$$  D:$$6a+b$$  请回答其中一个选项.