A student is investigating how the temperature of water affects how fast sugar dissolves. To make this a properly controlled experiment, what should the student do?

AUse the same mass of sugar and the same volume of water in each trial, varying only the water temperature

BUse different amounts of sugar at each temperature to see which dissolves fastest

CVary both the water temperature and the stirring speed to gather more data

DRun each trial only once to save time and average the result later

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