A heating-element wire has resistance $R$. It snaps and a different wire is fitted in its place. The table gives data for the original wire and the replacement wire. Original wire: length $l$, diameter $d$, resistivity of metal $\rho$. Replacement wire: length $l$, diameter $2d$, resistivity of metal $2\rho$. What is the resistance of the replacement wire?
- A$\frac{R}{4}$
- B$\frac{R}{2}$
- C$R$
- D$2R$