A silty soil of high compressibility is represented by

Why is this the answer?

USCS/IS soil classification: M = silt; H = high plasticity/compressibility (LL >= 50%); L = low plasticity (LL < 50%). MH = silty soil of high compressibility (LL >= 50%). Other symbols: CH = high-plasticity clay; CL = low-plasticity clay; ML = low-plasticity silt; OH = high-plasticity organic soil. MH plots below the A-line on Casagrande's plasticity chart. Highly compressible silt is MH.

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