在边长为1的正六边形 $ABCDEF$中，记以 $A$为起点，其余顶点为终点的向量分别为 $\stackrel{\rightharpoonup }{a_1},\stackrel{\rightharpoonup }{a_2},\stackrel{\rightharpoonup }{a_3},\stackrel{\rightharpoonup }{a_4},\stackrel{\rightharpoonup }{a_5}$；以 $D$为起点，其余顶点为终点的向量分别为 $\stackrel{\rightharpoonup }{d_1},\stackrel{\rightharpoonup }{d_2},\stackrel{\rightharpoonup }{d_3},\stackrel{\rightharpoonup }{d_4},\stackrel{\rightharpoonup }{d_5}$.若 $m,M$分别为 $\left(\stackrel{\rightharpoonup }{a_i}+\stackrel{\rightharpoonup }{a_j}+\stackrel{\rightharpoonup }{a_k}\right)·\left(\stackrel{\rightharpoonup }{d_r}+\stackrel{\rightharpoonup }{d_s}+\stackrel{\rightharpoonup }{d_t}\right)$的最小值、最大值，其中 $\left\{i,j,k\right\}\subseteq \left\{1,2,3,4,5\right\},\left\{r,s,t\right\}\subseteq \left\{1,2,3,4,5\right\}$,则 $m,M$满足（）

A．

$m=0,M>0$

B．

$m<0,M>0$

C．

$m<0,M=0$

D．

$m<0,M<0$