Copper is not present as an alloying constituent in

ANS:C - nichrome

Copper is not present as an alloying constituent in Nichrome. Nichrome is a non-ferrous alloy primarily composed of nickel and chromium, with smaller amounts of other elements such as iron, silicon, and sometimes aluminum. It is known for its high electrical resistivity, making it suitable for use in heating elements, electrical heating appliances, and resistance wires. While copper is commonly used as an alloying element in various alloys, including silicon bronze, constantan, and delta metal, it is not a constituent of nichrome. So, the correct answer is: Nichrome.