Correct Option (d)
Nichrome is an alloy primarily composed of nickel and chromium, often with small amounts of iron. It is known for its high electrical resistance and ability to withstand high temperatures. Its ductility allows it to be drawn into thin wires, while its hardness contributes to its durability in heating elements and resistance wires.
Incorrect Options:
Carborundum (silicon carbide) is an extremely hard and brittle material, used as an abrasive and in refractory applications. It lacks significant ductility.
Tungsten is a very hard and dense metal with the highest melting point of all metals. While it can be drawn into wires, its ductility is limited compared to Nichrome, especially at room temperature, and it is known for its brittleness under certain conditions.
Cast iron is an iron-carbon alloy with a relatively high carbon content (typically 2-4%). It is characterized by its hardness and compressive strength but is notably brittle and has very low ductility, making it prone to fracture under tension.