Assertion (A) In the periodic table of chemical elements, electron affinity always increases from top to bottom in a group. Reason (R) Atomic radii generally increase from top to bottom in a square.

• A. Both A and R are correct and R is the correct explanation of A
• B. Both A and R are correct but R and R is not the correct explanation of A.
• C. A is right but R is wrong
• D. A is wrong but R is right