Four liquids are placed in a graduated cylinder in the following order: 10 mL diethyl ether (density 0.71 g mL⁻¹), 10 mL water (density 1.00 g mL⁻¹), 10 mL glycerol (density 1.26 g mL⁻¹), and 10 mL carbon tetrachloride (density 1.59 g mL⁻¹). After vigorous shaking and subsequent settling, the ether remains immiscible with the other liquids, glycerol and water form a single homogeneous solution, and carbon tetrachloride remains immiscible with all others. Which arrangement of layers from top to bottom will most likely be observed?
a) Diethyl ether/carbon tetrachloride/glycerol–water solution
b) Diethyl ether/glycerol–water solution/carbon tetrachloride
c) Carbon tetrachloride/glycerol–water solution/diethyl ether
d) Glycerol–water solution/diethyl ether/carbon tetrachloride