[单选题]
A plastic block of d-3gs 8mv.9y ees1q rz)zq :t2m/ i.gc di5ksmji bbk5 78,kytyxmensions 2.00 cm x 3.00 cm x 4.00 cm has a mass of 30.0 g. byt y 5k,8bx7k What is its density?
A. $0.80 \; g/cm^{3}$
B. $1.20 \; g/cm^{3}$
C. $1.25 \; g/cm^{3}$
D. $1.60 \; g/cm^{3}$
