The correct answer is A. cast steel.
Cast steel is a type of steel that is made by melting and pouring molten steel into a mold. The molten steel then cools and hardens into the desired shape. Cast steel is a strong and durable material that is often used in construction and manufacturing.
Mild steel is a type of steel that is made by adding a small amount of carbon to iron. The carbon makes the steel stronger and more durable than iron. Mild steel is a common material that is used in a variety of applications, including construction, manufacturing, and transportation.
Cast iron is a type of iron that is made by melting and pouring molten iron into a mold. The molten iron then cools and hardens into the desired shape. Cast iron is a strong and durable material that is often used in construction and manufacturing. However, cast iron is also a brittle material that can easily crack or break.
Spring steel is a type of steel that is made by adding a small amount of carbon to iron. The carbon makes the steel stronger and more elastic than iron. Spring steel is a common material that is used to make springs, which are used in a variety of applications, including vehicles, appliances, and machinery.
In the case of loose jaws of steel trough sleepers, cast steel is the most appropriate material because it is strong, durable, and can withstand the weight of the sleepers.