The soil having more plasticity index is 

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  1. sand 
  2. silt 
  3. very fine sand 
  4. clay 

Answer (Detailed Solution Below)

Option 4 : clay 
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Explanation:

Plasticity index (PI) is the range of water content over which the soil remains in the plastic state. Mathematically defined as

Plasticity Index = Liquid Limit – Plastic Limit.

This parameter cannot be negative if the plastic limit, in some exceptions, is larger than the liquid limit, it is considered to be zero, and soil is considered non-plastic.

The plasticity of a soil is its ability to undergo deformation without cracking. It is an important index property of fine-grained soil, especially for clayey soils.
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