You've made the hypothesis that the higher the density of a rock, the higher the temperature at which it will melt, because a denser rock contains more material. What is one thing that you should control

You've made the hypothesis that the higher the density of a rock, the higher the temperature at which it will melt, because a denser rock contains more material.

What is one thing that you should control in an experiment designed to test this hypothesis?
A. the color of each rock
B. the weight of each rock
C. the density of each rock
D. the temperature at which each rock melts

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