Which of the following is a characteristic of fine-grained clastic rocks?

A) most clasts are visible with the unaided eye
B) the rocks are poorly sorted
C) the cobbles directly rest on one another without much matrix
D) the rocks tend to be easily eroded

Fine-grained clastic rocks, such as shale, are made of very small particles that are not easily seen with the unaided eye. These rocks tend to be more easily eroded compared to coarser-grained rocks because the smaller particles can be more readily detached and transported by erosive forces.