* Fragmental Sedimentary Rocks: These rocks are formed from pieces of pre-existing rocks (clasts) that have been broken down by weathering and erosion. Examples include conglomerate, breccia, sandstone, and shale.

* Rapid Burial: When clasts are buried quickly, they are less likely to be further broken down or chemically altered. This preserves the fragments, leading to the formation of a fragmental rock.

* Cementation: As the buried clasts are compacted by the weight of overlying sediments, minerals dissolved in groundwater precipitate between the clasts, acting as a cement that binds them together.

Why other options are less likely:

* Slow Burial: Slow burial allows for more weathering and erosion, potentially turning larger clasts into smaller ones, leading to different rock types (e.g., mudstone instead of sandstone).

* Chemical Weathering: This process breaks down rocks by chemical reactions, potentially dissolving or altering the clasts, leading to the formation of chemical sedimentary rocks (e.g., limestone).

* Biological Processes: While biological processes can play a role in sediment transport, they are less likely to directly influence the formation of fragmental rocks.

In summary: Rapid burial and cementation are the key factors that produce fragmental sedimentary rocks by preserving the pre-existing rock fragments.