8 8\,\, is equal to = ?

Answer: Option C

$$\begin{array}{rl}& \frac{\log \sqrt{8}}{\log 8}\\ & =\frac{\log {\left(8\right)}^{\frac{1}{2}}}{\log 8}\\ & =\frac{\frac{1}{2}\log 8}{\log 8}\\ & =\frac{1}{2}\end{array}$$