Number of molecules of carbon dioxide present in 44 gm $C{O}_2$ is

A. 12 x ${}^{{10}^{23}}$ approximately

B. 3 x ${ }^{{10}^{10}}$ approximately

C. 6 x ${ }^{{10}^{10}}$ approximately

D. 3 x ${}^{{10}^{23}}$ approximately