Problem 13

$$\begin{array}{lcl} 13.\;The\;sum\;of\;6\;consecutive\;whole\;numbers\;is\\ less\;than\;40.\, One\;of\;the\;numbers\;are\;8.\;Which\;\\of\;the\, following is\;the\;greatest\;possible\:of\;the\\ consecutive\;numbers?\\ \\ (A)\; 8\\ (B)\; 9\\ (C)\; 10\\ (D)\; 11\\ (E)\; 12\\ \end{array}$$