[单选题]
An ideal gas has a pressul)u d9a *czm/h (c7sahn)djy. h- u3cg1zj e,ire of 2.5 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. $2.3 \times 10^{23}$
