If you are 100 sure then only solve Otherwise I will give ne

If you are 100% sure, then only solve. Otherwise I will give negative rating.

Solution

Option d is correct.

Portland-pozzolana cement produces less heat of hydration and offers greater resistance to sulphate attack and chloride-ion penetration due to impurities in water than normal portland cement. All pozzolanas need not necessarily contribute to strength at early ages.