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Option 3 : Sand
Explanation:
Different types of soils are as follows:
| Plasticity index | Soil type | Degree of plasticity | Degree of cohesiveness |
| 0 | Gravel and sand | Non - plastic | Non-cohesive |
| < 7 | silty | Low plastic | Partly cohesive |
| 7 - 17 | silt clay | medium plastic | Cohesive |
| > 17 | clay | High plastic | Cohesive |
The plasticity index for soil is generally zero for gravels and sands.
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