According to Table 1, the concentrations of which of the following substances varies the least with temperature?

A solute is any substance that is dissolved in another substance, which is called the solvent. A student tested the solubility (a measure of how much solute will dissolve into the solvent) of six different substances. The solubility of a substance at a given temperature is defined as the concentration of the dissolved solute that is in equilibrium with the solvent. Table 1 represents the concentration of dissolved substances in 100 grams of water at various temperatures. The concentrations are expressed in grams of solute per 100 grams of water.

A. HCl
B. NH₃
C. NaCl
D. KCl

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Temp (°C) 0 20 40 60 80 100 Table 1 Concentration of solute (g/100 g H₂0) KCI NaNO3 HCI NH4Cl NaCl NH3 28 72 83 29 37 90 86 72 37 37 55 63 46 38 36 55 55 38 23 145 48 66 39 14 165 43 77 40 8 33 39 105 45 125 51 57