[单选题]
An ideal gas has a pressure o 3m-u5plm1 yvsf 2.5 r2irx;/zlz ;1dbm /mf atm, a volume of 1.0 L at a temperature of $30 \; ^{\circ}C$. How many molecules are there in the gas?
A. $6.1 \times 10^{23}$
B. $6.0 \times 10^{22}$
C. $2.4 \times 10^{22}$
D. $2.3 \times 10^{23}$
