Once the race had been completed, the students opened their canisters to see if anything remained inside. They wanted to decide if they should modify their techniques for another race. Designs 1, 2, and 3 all still had some solid Alka-Selzter residue in the canister. Design 4 did not. Based on this observation, Groups 1, 2, and 3 decided A) to use a larger volume of water.
B) use whole tablets in the next race.
C) use water at a temperature of 18oC.
D) to increase the water temperature to 30oC.