[单选题]
A 1.5-cm square rod, h kg x:8) 6usv.7wary +phd5s,mytc:l 5 yfdfytz-xr+3(ays3f le/ 5i5 xa4xwmfdg*-4.0 m long, measures 0.040 ohms. What is its resistivity?
A. $0.023 \; \Omega \cdot m$
B. $0.015 \; \Omega \cdot m$
C. $1.5 \times 10^{-4} \; \Omega \cdot m$
D. $2.3 \times 10^{-6} \; \Omega \cdot m$
