When ${\mathrm{K}}_2\mathrm{O}$ is added to water, the solution becomes basic in nature because it contains a significant concentration of :

Water becomes basic in nature when ${\mathrm{K}}_2\mathrm{O}$ is added since it has a substantial concentration of

${\mathrm{K}}_2\mathrm{O}+{\mathrm{H}}_2\mathrm{O}\to 2\mathrm{KOH}$ ($\mathrm{KOH}$ gives ${\mathrm{K}}^{+}$ and ${\mathrm{OH}}^{-}$)

Hence, the correct is option C.