Why Does Adding a Small Amount of Water to a Substance

Why does adding a small amount of water to a substance increase its cohesion but adding a lot of water decrease its cohesion?

A) A small amount of water decreases surface tension,allowing the grains to bond together,whereas too much water will increase surface tension and force the grains away from each other.
B) A small amount of water increases surface tension and holds the grain together.Too much water between the grains will eliminate surface tension.
C) Water has a small electrostatic force that disrupts the gravitational attraction of the grains and forces them to move away from each other.
D) A small amount of water will precipitate cement into the pores of the material,whereas too much water will not allow that cement to form.