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Directions \( \quad \) In the following
questions a statement of Assertion (A) followed by a
statement of Reason \( (\mathrm{R}) \) is given. Choose the correct
answer out of the following choices.
(a) Both A and R are correct; \( \mathrm{R} \) is the correct explanation of \( \mathrm{A} \).
(b) Both A and R are correct; \( \mathrm{R} \) is not the correct explanation of A.
(c) \( \mathrm{A} \) is correct; \( \mathrm{R} \) is incorrect.
(d) \( \mathrm{R} \) is correct; \( \mathrm{A} \) is incorrect.
Assertion (A) The second and third rows of transition elements resemble each other much more than they resemble the first row.

Reason (R) Due to lanthanoid contraction, the atomic radii of the second and the third row transition elements is similar.
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