How do the outer layers of cells on the underside of a leaf work to gather carbon dioxide?

The cells of a leaf are sandwiched in between two layers of epidermal cells, which provide the leaf with a waxy, nearly impermeable cuticle that protects against water loss. ... These intracellular spaces, along with the moist surface of mesophyll cells, facilitate the exchange of carbon dioxide and oxygen.

i think it's c

true is the answer : )