- A refrigerator door contains iron
- Iron is always magnetic
- Hence, a refrigerator door is magnetic

- A refrigerator door is magnetic
- A magnet attracts magnetic metals / ferromagnetic metals through magnetism
- So, a magnet can attract to a refrigerator door

Therefore, a magnet can attract to a refrigerator door
Question
Which of the following statements best explains why magnets usually stick to a refrigerator door?

Context
- A refrigerator door contains iron 
- Iron is always magnetic 
- A magnet attracts magnetic metals / ferromagnetic metals through magnetism