Let the eight sequentially number are = x+x+1+x+2+x+3+x+4+x+5+x+6+x+7

= 8x+28

According to the question

$$\begin{gathered} =\frac{\mathrm{x}+3+\mathrm{x}+4}{2}=6 \\ =\frac{2\mathrm{x}+7}{2}=6 \end{gathered}$$

= 2x+7=12

= 2x =5

x=$\frac{5}{2}$

Sum of all eight numbers= 8x+28

     = 8$\left(\frac{5}{2}\right)$+28

     = 20+28= 48

Hence, Option B is correct.