A container holds 40 g of argon-40 \(\left( {_{{\text{18}}}^{{\text{40}}}{\text{Ar}}} \right)\) and 8 g of helium-4 \(\left( {_{\text{2}}^{\text{4}}{\text{He}}} \right)\).

What is the \(\frac{{{\text{number of atoms of argon}}}}{{{\text{number of atoms of helium}}}}\) in the container?

A.     \(\frac{1}{2}\)

B.     \(\frac{2}{9}\)

C.     \(\frac{2}{1}\)

D.     \(\frac{9}{2}\)

A