Answer:
D) sediment; horizontally
Step-by-step explanation:
The gravitational force is a force of attraction, which attract particles or objects in the neighborhood of the earth towards it surface. This is the major cause of the horizontal layers originally formed by sediments.
The sediment is formed one layer after the other horizontally, due to gradual deposition of its particles. And the sediment is made compact due to the force of gravity which compresses the layers together.