Among the options provided, which salt is does not have water of crystallization?

Baking soda does not contain water of crystallization. 

Water of crystallization is the water that is chemically bound within the crystal structure of a compound.

Blue vitriol (${\mathrm{CuSO}}_4 · 5{\mathrm{H}}_2\mathrm{O}$), washing soda (${\mathrm{Na}}_2{\mathrm{CO}}_3· 10{\mathrm{H}}_2\mathrm{O}$), and gypsum (${\mathrm{CaSO}}_4 · 2{\mathrm{H}}_2\mathrm{O}$) all contain water of crystallization