Kelly needs to separate a mixture of sand and sawdust. She tried using tweezers to pick out the pieces of sawdust, but that didn't work. Her grandfather suggested she use water. How will water help Kelly separate the mixture? O A. The sand will dissolve in water, but the sawdust will not. O B. The sand will react with water, but the sawdust will not. O C. The sand will sink in water, but the sawdust will float in water. O D. The sand will float in water, but the sawdust will sink in water.