11.2.3 + 12.3.4 + 13.4.5 + 14.5.6 is equal to = ?

Answer: Option A

$$\begin{array}{rl}& \text{Given expression,}\\ & \frac{\mathrm{4.5.6}+5.6+2.6+2.3}{\mathrm{1.2.3.4.5.6}}\\ & =\frac{120+30+12+6}{720}\\ & =\frac{168}{720}\\ & =\frac{7}{30}\end{array}$$