$\begin{array}{l}\text{Here,}\\ \\ \Rightarrow 4\frac{1}{5}\times 3\frac{1}{3}\text{+? = 20\% of 120}\\ \\ \text{It can also be written as}\\ \\ \Rightarrow \frac{21}{5}\times \frac{10}{3}+?=\frac{1}{5}\times 120[\because 20\%=\frac{1}{5}]\\ \\ \Rightarrow \frac{21}{5}\times \frac{10}{3}+?=24\\ \\ \Rightarrow 7\times 2+?=24\\ \\ \Rightarrow ?=24-14=10\end{array}$

Hence, Option B is correct.