Hardcore Is Used in the Construction of Solid Ground Floors

Hardcore is used in the construction of solid ground floors to

A) Reduce heat transmission from the building to the ground beneath
B) Reduce the formation of condensation in the floor structure
C) Prevent differential settlement between the floor structure and the surrounding external walls
D) Provide a dry, level surface for the floor slab
E) Reduce sound transmission from the building to the ground beneath