Rose wanted to know: “in which water, hot, lukewarm, or cold, will rock salt dissolve the fastest?” She got three identical cups and labeled them A, B, and C. using the graduated cylinder to measure equal amounts, she filled cup A with hot water, cup B with lukewarm water and, cup C with cold water.

With the help of two of her classmates, they added, at the same time, half of teaspoon of rock salt into each cup. They the stirred the salt and water mixture in each cup, five times in clockwise direction.



Which of the following is the INDEPENDENT variable?


A. Cup
B. Rock salt
C. Temperature of water
D. Amount of water