Coefficient of consolidation of a soil is affected by

Answer: Option C

The coefficient of consolidation of a soil is affected by both compressibility and permeability.

The coefficient of consolidation (C_v​) is a measure used in soil mechanics to describe how fast a soil consolidates under load.

Compressibility influences how much volume change occurs in the soil when a load is applied.

Permeability determines the rate at which water can flow through the soil pores, affecting how quickly excess pore water pressure dissipates.

Therefore, the coefficient of consolidation is dependent on both these properties, making Option C the correct answer.