Addition of grog in fireclay brick during its manufacture is advantageous, because it results in_____________________?

• A. Less shrinkage in heating, decreased apparent porosity & increased specific gravity
• B. High strength & thermal spalling resistance
• C. Less addition of water to get a workable plasticity & lesser time required for drying the raw refractories and hence increased rate of production
• D. All A., B. and C.