Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: Helium is used to dilute oxygen in diving apparatus. Reason R: Helium has high solubility in O_2. In the light of the above statements, choose the correct answer from the options given below. A.Both A and R are true but R is NOT the correct explanation of A. B.A is true but R is false. C.A is false but R is true. D.Both A and R are true and R is the correct explanation of A.