The rock that is classified an evaporite is crystalline rock salt. Option 4
Evaporites are sedimentary rocks that form through the precipitation of minerals from concentrated solutions due to the evaporation of water. Rock salt, composed mainly of the mineral halite (sodium chloride), is a classic example of an evaporite rock.
It forms when saline water bodies evaporate, leaving behind deposits of halite crystals. Clastic shale (1), foliated phyllite (2), and nonfoliated marble (3) are not classified as evaporites but rather belong to different rock types formed through other geological processes.
The complete question:
Which rock is classified as an evaporite?
1. clastic shale
2. foliated phyllite
3. nonfoliated marble
4. crystalline rock salt