A whole sugar cube is added and the water is stirred. A whole sugar cube is added and the water is not stirred. A crushed sugar cube is added and the water is stirred. A crushed sugar cube is added and the water is not stirred.
Under which conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature?

Options:
- A whole sugar cube is added and the water is stirred.
- A whole sugar cube is added and the water is not stirred.
- A crushed sugar cube is added and the water is stirred.
- A crushed sugar cube is added and the water is not stirred.

A crushed sugar cube is added and the water is stirred.