Ella says:" I can run $18\text{km}$ every hour."  Vivian says: " Haha, I am the faster runner because I can run $100\text{m}$ every $21\text{s}$."  Vivian\textquotesingle s statement is~\uline{~~~~~~~~~~}~because it only takes Ella~\uline{~~~~~~~~~~}~$\text{s}$ to run $100\text{m}$. 
选项为:A:correct, 200  B:correct, 60  C:wrong, 20  D:wrong, 10  请回答其中一个选项.