A lizard is $20\rm cm$ in length.  The lizard can walk $1.5$ times its own length every second.  How long would it take the ant to walk $36\rm m$? 
选项为:A:$2\textasciitilde\rm minutes$  B:$20\textasciitilde\rm seconds$  C:$40\textasciitilde\rm seconds$  D:$20\textasciitilde\rm minutes$  E:$1\textasciitilde\rm minute$  请回答其中一个选项.