The correct answer is: D. Impervious.
Glazing is a liquid glass that is applied to the surface of earthenware and then fired in a kiln. The glaze melts and fuses to the surface of the earthenware, creating a hard, impervious layer that protects the pottery from water and other liquids.
Option
A is incorrect because glazing does not make earthenware hard. In fact, glazing can actually make earthenware more fragile, as the glaze can crack or chip if it is not applied properly.Option B is incorrect because glazing does not make earthenware soft. In fact, glazing can actually make earthenware more durable, as the glaze protects the pottery from scratches and other damage.
Option C is incorrect because glazing does not make earthenware porous. In fact, glazing can actually make earthenware less porous, as the glaze seals the pores in the pottery.