Which of the following pairs of substances are likely to be miscible?
a. $\quad \mathrm{Br}_{2}$ and benzene $\left(\mathrm{C}_{6} \mathrm{H}_{6}\right)$
b. $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OCH}_{2} \mathrm{CH}_{3}$ (diethyl ether) and $\mathrm{CH}_{3} \mathrm{COOH}$
(acetic acid)
c. $\mathrm{C}_{6} \mathrm{H}_{12}$ (cyclohexane) and hexane $\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}_{3}\right)$
d. $\mathrm{CS}_{2}$ (carbon disulfide) and $\mathrm{CCl}_{4}$ (carbon tetrachloride)