ANS:C - ductile

Fibrous fracture is normally encountered in ductile materials. Ductile materials are capable of undergoing significant plastic deformation before failure. When they fracture, the process often involves the formation and propagation of microscopic voids or cracks, leading to the development of a fibrous appearance in the fracture surface. This fibrous appearance is characteristic of ductile fracture, where the material exhibits significant deformation and stretching before finally breaking. In contrast, brittle materials tend to fail suddenly and without significant deformation, resulting in a smooth and flat fracture surface.