what is function of the chemical $$SO_3$$ present in ordinary portland cement?​

Correct option is B

→ $$SiO_2$$  imparts strength to cement.

→ $$CaSO_4$$ imparts initial setting time of cement.

→ Magnesia imparts hardness and colour.
→ Alumina imparts quick setting property to the cement.
→ SO3 makes cement sound