ANS:B - copper

The most suitable material for die casting is not listed in the options provided. Die casting typically involves the use of non-ferrous metals, particularly aluminum and zinc alloys. Aluminum and zinc alloys are commonly used in die casting due to their favorable characteristics, such as:

• Good fluidity, allowing for intricate and precise casting shapes.
• High strength-to-weight ratio, making them suitable for lightweight components.
• Excellent corrosion resistance.
• Good dimensional stability.
• Ease of machining and finishing.

While iron, copper, steel, and nickel are used in various casting processes, including die casting, they are not as commonly used as aluminum and zinc alloys due to factors such as higher melting temperatures, lower fluidity, and other processing considerations. Therefore, the most suitable material for die casting is typically aluminum or zinc alloys, not iron, copper, steel, or nickel.