Final answer:
The nail product that protects against stickiness is the base coat. (Option b)
Step-by-step explanation:
A base coat is a clear polish applied to the nails before the application of colored polish. Its primary functions include providing a smooth surface for the colored polish to adhere to, promoting longer-lasting nail color, and preventing staining of the natural nails.
Additionally, a quality base coat can act as a barrier between the nail plate and the pigments in colored polishes, preventing potential discoloration and enhancing the overall appearance of the manicure. While a top coat (option a) is applied after the colored polish for added shine and durability, the base coat plays a crucial role in protecting the nails and ensuring a polished finish without stickiness.
Therefore, the correct option is: b. base coat