Read the passage about Mr. Ellis.
Mr. Ellis is showing his science class how salt dissolves in water. He pours 500 mL of water into a saucepan. He turns on the burner to a medium heat for 5 minutes. He adds 30 grams of salt to the water, starts a timer, and stirs gently for 2 minutes. He records how long it takes for the salt to dissolve.
Mr. Ellis wants to slow the speed of the salt dissolving. Which change to his method would most likely help him to do this?
A.
He should stir vigorously for 2 minutes.
B.
He should turn down the heat on the burner.
C.
He should add 20 grams of salt instead of 30.
D.
He should use 1000 mL of water instead of 500.