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Direction: In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice.
Assertion: Mendeleevs arranged elements in horizontal rows and vertical columns.

Reason: Mendeleevs ignored the order of atomic mass thinking that the atomic measurements might not be correct.
a. Both \( A \) and \( R \) are individually true and \( R \) is the correct explanation of \( A \) :
b. Both \( A \) and \( R \) are individually 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
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