Assertion A : From consideration of structural soundness and economy of design, most codes control the maximum slenderness ratio of masonry walls and columns. Reason R : By controlling the maximum slenderness ratio, failure is by excessive stress and not by buckling.?

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Assertion A : From consideration of structural soundness and economy of design, most codes control the maximum slenderness ratio of masonry walls and columns. Reason R : By controlling the maximum slenderness ratio, failure is by excessive stress and not by buckling.?

Select your answer according to codes given below.
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 .the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.