The class in which the number of boys passed is nearest to the average number of girls passed per class, is-

Answer: Option D

$$\begin{array}{rl}& \text{Average no. of girls}\\ & =\frac{70+100+50+80+90}{5}\\ & =\frac{390}{5}\\ & =78\end{array}$$
Class VI boys is nearest to the average no. of girls passed per class.