In this question

$\begin{array}{l}\text{37.5}÷\left[\frac{1}{2}\text{\hspace{0.17em}of}(24+33)-13\frac{1}{2}\right]=?\\ \Rightarrow \text{\hspace{0.17em}37.5}÷[\frac{1}{2}\times 57-\frac{27}{2}]\\ \Rightarrow \text{\hspace{0.17em}37.5}÷\left[\frac{57-27}{2}\right]\\ \Rightarrow 37.5÷15\\ \Rightarrow ?=2.5\end{array}$

Hence, Option B is correct.