[单选题]
A plastic block of dw 8bf4qm4umsa 54( empimensions 2.00 cm xwuttaoy 44; idt(p*fzj04 q8d 3.00 cm x 4.00 cm has a mass of 30.0 g. What is it4*4zdq8tp(t0fy4td uai j;o w s density?
A. $0.80 \; g/cm^{3}$
B. $1.20 \; g/cm^{3}$
C. $1.25 \; g/cm^{3}$
D. $1.60 \; g/cm^{3}$