Which statement from following about nano-material is NOT correct?

$1 \mathrm{nm}=$_____ $\mathrm{m}$?

$$\begin{gathered} \mathrm{A} : {10}^{-9} \\ \mathrm{B} : {10}^9 \\ \mathrm{C} : {10}^{-8} \end{gathered}$$

Enter your correct answer as $\mathrm{A}. \mathrm{B} \mathrm{or} \mathrm{C}$.

_____ is the design, characterisation, manipulation, manufacture and use of structures, devices, and systems by manipulating size and form at the nanoscale.