Given,

$$\begin{gathered} 2\frac{3}{10}\times 4\frac{6}{7}\times 7\frac{1}{2}=? \\ =\frac{23}{10}\times \frac{34}{7}\times \frac{15}{2} \end{gathered}$$

It can be approximated as

$\begin{array}{l}\Rightarrow \frac{20}{10}\times \frac{35}{7}\times \frac{16}{2}=?\end{array}$

= 2×5×8= ?

= 80 ≈ 84

Hence, Option D is correct.