(A) The unit $nm$ stands for nanometer, which is equal to $10^{-9} \, m$.To convert $nm$ to $\mathring{A}$, we know that $1 \, \mathring{A} = 10^{-10}

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(A) The unit $nm$ stands for nanometer, which is equal to $10^{-9} \, m$.To convert $nm$ to $\mathring{A}$, we know that $1 \, \mathring{A} = 10^{-10} \, m$.Therefore, $1 \, nm = 10^{-9} \, m = 10 \times 10^{-10} \, m = 10 \, \mathring{A}$.Thus, option $A$ is correct.