Here, this expression is based on

$$\begin{gathered} \begin{array}{l}[{\text{a}}^{\text{2}}-{\text{b}}^{\text{2}}\text{= (a+ b)(a}-\text{b)}]\\ \\ \text{So, }\\ {\text{= 66}}^{\text{2}}-{\text{34}}^{\text{2}}\end{array} \\ \text{= (66 + 34)×(66}-\text{34)} \\ \text{= 100}\times \text{32 = 3200} \end{gathered}$$

Hence, Option B is correct.