Sodium carbonate is also called 

White and crystalline, sodium carbonate is a substance. It is available as decahydrate salt, heptahydrate salt, monohydrated salt, and anhydrous salt. Its nature is fundamental. When heated, it has a propensity to lose water molecules and produce soda ash, an anhydrous salt.

The chemical formula for sodium carbonate is ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$.It is also called as washing soda.

The uses for washing soda include as a cleansing agent in industries and households.

 Sodium carbonate is also called washing soda.

Hence option B is correct.