JEE Main 2021 Chemistry question

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant element in the troposphere. Reason R : Hydrogen is the lightest element. In the light of the above statements, choose the correct answer from the options given below :

• (A)A is true but R is false
• (B)Both A and R are true and R is the correct explanation of ACorrect
• (C)A is false but R is true
• (D)Both A and R are true but R is NOT the correct explanation of A