Which sentence indicates that the rock formation described is sedimentary?

O a group of young geologists were out on a fishing trip when they came across a peculiar rock formation near the edge of the river.
O the formation was about the size of a basketball. the bottom third of the rock had a jagged crack running through it. the rocks surface was speckled with patches of different shapes and sizes.
O the minerals in the formation were small and were held together by a calcite cement. the majority of the formation was light brown and had a rough, grainy texture.