Answer:
Does it form solution?
If yes, then B.) deliquescent
If no, then C.) hygroscopic
Explanation:
When a substance is exposed to air, it either gives off or absorbs water (moisture) from the air. These phenomenons are explained in Efflorescence, Hygroscopy, and Deliquescence
Hygroscopic and deliquescent materials are both able to absorb moisture from the air. But while hygroscopic materials (e.g NaCl, silica gel) absorb moisture and become damp and sticky, deliquescent materials (e.g. CaCl2 and solid NaOH) dissolves in water absorbed from the air and liquefy.
