A science class conducts an experiment about temperature and the motion of particles. The students are given three cups. Each cup holds 150 milliliters of water. Cup A has water at room temperature, cup B has cold water, and cup C has very warm water. The students add three
drops of red food coloring to the center of each cup at the surface of the water. They observe the water for 1 minute.
What is the responding variable in this experiment?
O A. the number of cups
O B. the temperature of the water
O c. the amount of water in each cup
O D. the rate of dispersion of the food coloring