The right option is; b. detrital
Sandstone is a detrital sedimentary rock.
Sandstone is a detrital sedimentary rock that is made up of sand-sized mineral particles or rock fragments and is formed when pre-existing rocks are weathered by agents such as wind, water or ice. Sandstones usually contain quartz or feldspar due to their resistance to weathering processes and they may have any colour such as yellow, tan, brown, grey, white, and black.
