I’m pretty sure it is C. Tricep Extension
Calcium and magnesium dissolved in water are the two most common minerals that make water "hard." The degree of hardness becomes greater as the calcium and magnesium content increases and is related to the concentration of multivalent cations dissolved in the water.
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- - The Sun keeps all of the planets orbiting it because of its large captivity.
ღ So in other words, it keeps orbiting due to its largest and the amount of gravity it is concealing.