How Do the Strength and Cohesion of Clay-Rich Regolith or Soil

Multiple Choice

How do the strength and cohesion of clay-rich regolith or soil change with the addition of water?

A) Water does not affect the cohesion but lowers the strength.
B) Water reduces the strength of clays but raises the cohesion of the soil.
C) Water increases the strength and cohesion.
D) Water lowers the strength and cohesion.