D .steel
Because it has carbon which is non metal

D .steel
Because it has carbon which is non metal

D steel

The alloy that contains a non-metal as one of its constituents is steel.

Explanation: Steel is primarily composed of iron (a metal) and carbon (a non-metal).

Why other options are incorrect:

Brass: Brass is an alloy of copper and zinc, both metals.
Bronze: Bronze is also an alloy of metals, specifically copper and tin.
Amalgam: Amalgam is an alloy of mercury with other metals.