[单选题]
A 120-m long copper wire (res +0v3mq 8r5jbc )5 de btt5hdlusa4wf3n7qy)distivit+ s0:nf venw)vtl7o-q y $1.68 \times 10^{-8} \; \Omega \cdot m$) has resistance $6.0 \; \Omega$. What is the diameter of the wire?
A. $0.065 \; mm$
B. $0.65 \; mm$
C. $0.65 \; cm$
D. $0.65 \; m$
