Correct option is (b) Set and harden in the presence of water
Easiest explanation: All portland cements are hydraulic cements because they set and harden under water. This cement not only hardens by reacting with water but also forms a water-resistant product. Portland cement is the most common type of cement in general use around the world, used as a basic ingredient of concrete, mortar, stucco, and most non-speciality grout.