A copper wire is suspended vertically from a stationary support. A load is fixed to the bottom end of the wire, causing an extension $x$. The wire follows Hooke’s law. Which one change would produce an extension of $2x$?
- AHalve the cross-sectional area of the wire.
- BHalve the diameter of the wire.
- CHalve the length of the wire.
- DHalve the load on the wire.