In this question 

We follow the BODMAS rule and then apply rule of decimals

$\begin{array}{l}\text{So, 25}\times \text{3.25 + 50.4}÷\text{24}\\ \Rightarrow \text{ ? = 25}\times \text{3.25 + 2.1}\\ \Rightarrow \text{ ? = 81 .25 + 2.10}\\ \Rightarrow \text{ ? = 81 .25 + 2.10}\\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}? = 83.35}\end{array}$

Hence, Option B is correct.