Step 1: Understand the question.
We must pick the element that is ferromagnetic. Ferromagnetic means it can become a strong permanent magnet.
Step 2: Recall which elements are ferromagnetic.
Only a few metals behave this way. The common ones are iron, cobalt and nickel. They have unpaired electrons whose tiny magnets line up together.
Step 3: Check nickel.
Nickel (Ni) is one of the three classic ferromagnetic metals, so it qualifies.
Step 4: Check copper.
Copper (Cu) has no unpaired electrons in its usual state, so it is diamagnetic, not ferromagnetic.
Step 5: Check scandium and zinc.
Scandium (Sc) has just one unpaired electron, so it is only weakly paramagnetic. Zinc (Zn) has a full d shell, so it is diamagnetic. Neither is ferromagnetic.
Step 6: Choose the answer.
The ferromagnetic element is nickel, which is option 1.
\[ \boxed{\text{Ni}} \]