Масъала 5 аз 88

A. $\mathrm{CaCl}_{2}$ ва $\mathrm{CO}_{2}$ B. $\mathrm{Al}_{2} \mathrm{O}_{3} \mathrm{Ba} \mathrm{KOH}$ C. $\mathrm{K}_{2} \mathrm{O}$ ва Au D. NaOH ва Pt