[单选题]
Two liters of a perfe8co(vibx8 -0 ehn(bmcct gas are ab::0jijq 1 vkw/p yed-he21/ -z gjsept $0 \; ^{\circ}C$ and 1 atm. If the gas is nitrogen, $N_2$, determine the number of molecules.
A. $3.5 \times 10^{22}$
B. $5.3 \times 10^{22}$
C. $4.7 \times 10^{22}$
D. $7.4 \times 10^{22}$
