Dear Student,
(A) Na2CO3 is used for the preparation of Borax (Na2B4O7)
$4{H}_{3}B{O}_{3}+N{a}_{2}C{O}_{3}\stackrel{}{\to }N{a}_{2}{B}_{4}{O}_{7}+6{H}_{2}O+C{O}_{2}$
(B) Sodium carbonate (or washing soda) is employed as a cleansing agent for household purposes like laundry. Sodium carbonate is a component of many dry soap powders/detergents.
(D) Sodium carbonate is used to remove the permanent hardness of the water.
Permanent hardness is due to Ca+2/ Mg+2 and Cl-/SO42-

Option (C) is correct: Washing soda is not used for making toys and materials for decorations.

Regards

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