$\begin{array}{l}\text{ Here,\hspace{0.17em}\hspace{0.17em}}\\ \Rightarrow \text{76\% of 1285=35\% of 1256+?}\\ \\ \Rightarrow \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}? = 76\% of 1285}-\text{35\% of 1256}\\ \\ \Rightarrow \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}?=1285}\times \frac{76}{100}-\frac{35}{100}\times 1256\\ \\ \Rightarrow \text{\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}? = 976.60}-\text{439.60}\\ \\ \Rightarrow \text{ \hspace{0.17em}? = 537}\end{array}$

Hence, Option B is correct.