A. Metals are malleable materials. Malleability is the ability of a material to deform under compressive stress, without cracking or breaking, to form a new shape. Metals have a high degree of malleability due to their metallic bonds which allow the atoms to slide past each other without breaking.
B. Ceramics are generally not malleable, as they are brittle and tend to fracture under stress.
C. Composites can be malleable or not depending on their constituent materials and their properties.
D. Salt is a brittle material and is not malleable.