Choose the word which is different from the rest.

The answer is C. Safe.

A safe is a strong box for storing valuables, typically made of steel and with a complex locking mechanism. A rack is a structure for supporting or storing things, typically consisting of a framework of parallel bars or shelves. An almirah is a large cupboard, typically with a door or doors at the front. A cupboard is a piece of furniture with shelves or drawers for storing things.

A safe is different from the other options because it is specifically designed to store valuables, while the other options are more general-purpose storage containers.