What action describes creating an obstruction or bend in a material?

The action that describes creating an obstruction or bend in a material is referred to as "kink." This term specifically indicates the act of deforming a material, often resulting in a sharp bend or twist that may compromise its structural integrity or flow capacity, especially in contexts involving cables, hoses, or pipes.

In contrast, the other terms do not convey a similar meaning. "Loosen" implies making something less tight or rigid, which does not relate to creating a bend or obstruction. "Leck" is not a standard term in this context and does not apply to physical deformation of materials. "Nick" refers to making a small cut or notch, which also does not involve creating a bend or obstruction. Thus, "kink" is the choice that directly represents the action of creating an obstruction or bend in a material, leading to its identification as the correct answer.