Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. in order to get the best results, the student should: a. keep the temperature of the water constant for all three trials b. repeat each trail multiple times c. use the same water container for all three trails d. all of above