Which of the following contains the maximum number of atoms?

Maximum No. of atoms $=\frac{\mathrm{w}}{\mathrm{GMWt}}\times {\mathrm{N}}_{\mathrm{A}}\times \mathrm{No}. \mathrm{of} \mathrm{atoms}$

$\mathrm{Maximum} \mathrm{No} \mathrm{of} {\mathrm{CaCO}}_3 \mathrm{atoms}=\frac{10}{100}\times {\mathrm{N}}_{\mathrm{A}}\times 5=0.5{\mathrm{N}}_{\mathrm{A}}$

Maximum No. of H atoms in 4g ${\mathrm{H}}_2=\frac{4}{2}\times {\mathrm{N}}_{\mathrm{A}}\times 2=4{\mathrm{N}}_{\mathrm{A}}$

Maximum No. of in ${\mathrm{NH}}_4{\mathrm{NO}}_3=\frac{9}{80}\times {\mathrm{N}}_{\mathrm{A}}\times 9=1.01{\mathrm{N}}_{\mathrm{A}}$

$\mathrm{Maximum} \mathrm{No}.\mathrm{of} \left({\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6\right)\mathrm{atoms} {\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6=\frac{1.80}{180}\times {\mathrm{N}}_{\mathrm{A}}\times 24=0.24{\mathrm{N}}_{\mathrm{A}}$