This is an not an alloy of copper-
Solder
The explanation for the correct option: Option C
Solder is an alloy of lead and zinc metals.
The explanation for the incorrect option:
Option A: Brass is an alloy of zinc and copper metals.
Option B: Bronze is an alloy of Tin and copper metals
Option D: Duralumin is an alloy of Aluminium, Manganese, Magnesium and copper metals.
Therefore, Option C is correct.