ANS:C - annealed

To counteract the bad effects of strain hardening on a cold formed part, it must be annealed. Explanation: Strain hardening, also known as work hardening, occurs when a metal is subjected to plastic deformation, such as cold forming or cold working. This process increases the dislocation density within the metal's crystal structure, leading to an increase in hardness and strength but also a decrease in ductility. To counteract the negative effects of strain hardening and restore the ductility of the metal, the cold formed part must undergo a heat treatment process known as annealing. Annealing involves heating the metal to a specific temperature (often below the recrystallization temperature) and holding it at that temperature for a period of time before slowly cooling it down. This process allows the metal's crystal structure to recrystallize and the dislocations to rearrange, reducing the internal stresses and restoring ductility to the material. Therefore, to counteract the bad effects of strain hardening on a cold formed part, it must be annealed.