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 O2 . In the light of the above statements, choose the correct answer from the options given below

1. A. Both A and R are true and R correct explanation of A
2. B. Both A and R are true and R is NOT the correct explanation of A
3. C. A is true but R is false
4. D. A is false but R is true

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