1 mole of $C{O}_2$ contains:

The correct option is C $6.023\times {10}^{23}$ molecules of $C{O}_2$
1 mole $C{O}_2$ contains $N_A$ number of molecules.
1 molecule of $C{O}_2$ contains 1 $C$ atom.
$N_A$ molecule of $C{O}_2$ contain $N_A$ $C$ atoms.
1 molecule of $C{O}_2$ contain 2 $O$ atoms.
$N_A$ molecule of $C{O}_2$ contains = $2\times N_{A}O$ atom
$N_A=\text{Avogadro number}=6.023\times {10}^{23}$