Here, 

$\begin{array}{l}\Rightarrow \text{36\% of 420}-\text{56\% of 350 =?}-\text{94}\\ \\ \Rightarrow \frac{36}{100}\times 420-\frac{56}{100}\times 350=?-94\\ \\ \Rightarrow \text{151.20}-\text{196+ 94 =?}\\ \\ \Rightarrow \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}? =15120+ 94-196}\\ \\ \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}=2452}-\text{196= 49.2}\end{array}$

Hence, Option B is correct.