Answer:
it will be Shale
Explanation:
Because a rock that acts as a barrier to water is a permeability barrier. This cannot be a porous rock such as a clean sandstone, or diatomite (both porous). A fractured limestone will allow solutions to pass through it either along fractures or by dissolving the limestone. A shale is made up of fine clay particles that are tightly packed together and therefore impermeable.
