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.
I gave my students this multiple choice question: Under which conditions would a sugar cube dissolve most quickly when placed in a liter of water at room temperature?

Only one answer is correct among these 4 choices:
- 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.

Could you tell me which one is correct?

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