The radius of a coin is $$3\text{cm}$$. When $$4000$$ of these coins are placed side by side in a straight line, how long would this line be? 
选项为:A:$$240\text{cm}$$  B:$$12\text{m}$$  C:$$240\text{m}$$  D:$$1.2\text{km}$$  E:$$2.4\text{km}$$  请回答其中一个选项.