Amy and Bella bought some cookies in the ratio of $$3:4$$. Bella gave $$9$$ cookies to Amy. Then the ratio of the number of cookies Amy had to that of Bella was $$1:1$$. How many cookies did they have at first? 
选项为:A:$$54$$  B:$$63$$  C:$$72$$  D:$$126$$  请回答其中一个选项.