ANS:A - ferromagnetic

Nickel is a ferromagnetic material. Ferromagnetism is a property exhibited by certain materials, such as iron, nickel, and cobalt, where they become strongly magnetized in the presence of an external magnetic field. This magnetization persists even after the removal of the external field, resulting in the materials possessing permanent magnetization. Nickel, like iron and cobalt, is one of the most commonly known ferromagnetic materials. It can be magnetized to a significant degree, making it useful in various applications, including magnetic alloys, permanent magnets, and magnetic shielding. So, the correct answer is ferromagnetic.