My sister runs $$10\text{km}$$ per hour, and I run $$2\text{km}$$ in $$15$$ minutes. If we both run for $$2$$ hours, my sister will run$$\text{km}$$ farther than I will. 
选项为:A:$$2$$  B:$$4$$  C:$$6$$  D:$$8$$  请回答其中一个选项.