<human>: Objective: To make a sand cast aluminum ring holder,

Which of the following solutions is more sound in terms of naive physics reasoning?

OPTIONS:
- melt iron scraps inside a little aluminum container using an oven that can reach very high temperatures (800° C).
- melt aluminum scraps inside a little iron container using an oven that can reach very high temperatures (800° C).
<bot>: melt aluminum scraps inside a little iron container using an oven that can reach very high temperatures (800° C).