Please choose the correct answer to the question: The force required to swim through ocean water is greater than the force needed to swim in a heated pool because

Answer1: pool water is usually cooler than ocean water Answer2: pool waves carry more turbulence than ocean waves Answer3: pool water has less mass and density than saltwater Answer4: saltwater has less mass and density than pool water

Answer format: answer1/answer2/answer3/answer4
Answer: answer3