To determine which metal would replace aluminum in a replacement reaction, we refer to the reactivity series. In the reactivity series, a more reactive metal can displace a less reactive metal from its compound.
Aluminum is generally considered to be more reactive than zinc and copper, but less reactive than sodium. Gold is the least reactive among the options provided. Therefore, the only metals that can replace aluminum in a replacement reaction would be those that are lower in the reactivity series than aluminum.
In this case, both zinc and copper could replace aluminum, but sodium cannot replace aluminum because it is more reactive.
So, the metal that would replace aluminum in a replacement reaction from the options you've given is:
Copper.