If one mole of carbon atoms weigh 12 grams, what is the mass (in grams) of 1 atom of carbon?

Question

$\begin{array}{1 1} (a) 1.6 \times 10^{-23}\;g \\ (b) 1.99 \times 10^{-23}\;g \\ (c) 1.6 \times 10^{-20}\;g \\ (d) 1.78 \times 10^{-21}\;g \end{array}$