B. Iron (II) sulphate
The salt that gives a pale-green precipitate with sodium hydroxide solution, and a white precipitate with barium chloride solution is iron (II) sulphate.
FeSO4 + 2NaOH → Fe(OH)2 + Na2SO4
Pale Green precipitate
FeSO4 + BaCl2 → BaSO4 + FeCl2
White precipitate