Sedimentary rock to form sediment. a. heats up b. weathers c. compacts d. crystallizes

B. weathers

Explanation:

Sedimentary rocks are the rocks that are formed by the accumulation of small particles also called as sediments. These rocks are formed by the compaction or cementation of organic and inorganic particles  coming from the animals, plant source and weathering of other parent rocks, organic particles from the oceanic floors all contributes to the formation of the sedimentary rocks.  

The sedimentary rock weathers to form the sediments. These rocks can come in contact of high speed wind currents, water or any other agent which can distort or disintegrate these rocks into sediments by the process of weathering.

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