Salt and sand are added to hot water and stirred making a mixture. Oil and water are placed in a sealed bottle and shaken making a compound. Sugar and water are added to flour and cooked in an oven making an element. Soil and water are shaken in a container and left to separate forming two elements.
I gave my students this multiple choice question: Which procedure correctly describes materials combining?

Only one answer is correct among these 4 choices:
- Salt and sand are added to hot water and stirred making a mixture.
- Oil and water are placed in a sealed bottle and shaken making a compound.
- Sugar and water are added to flour and cooked in an oven making an element.
- Soil and water are shaken in a container and left to separate forming two elements.

Could you tell me which one is correct?

Salt and sand are added to hot water and stirred making a mixture.