ANS:D - all the above.

1. The value of the angle of repose: The angle of repose is the maximum angle at which a pile of unconsolidated granular material remains stable without sliding. The moisture content of soil can influence its cohesion and internal friction, which in turn can affect the angle of repose.
2. The amount of compaction required: Moisture content significantly affects the compaction characteristics of soils. Optimal moisture content is necessary to achieve maximum compaction and density. Too much or too little moisture content can hinder compaction efforts.
3. The cohesive strength of soil: Cohesive soils, such as clays, are particularly sensitive to changes in moisture content. The presence of water can enhance the cohesive strength of clay soils, while excessive water can lead to reduced strength due to softening and increased pore pressure.