question_answer

     

Assertion [A]: A man standing on a completely frictionless surface can propel himself by whistling.

Reason [R]: If no external force acts on a system, its momentum cannot change.                    [IAS Prelim]

A) Both A and R are true and R is the correct explanation of A

B) Both A and R are true but R is not a correct explanation of A

C) A is true but R is false

D) A is false but R is true