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a
Increases from left to right and decreases from top to bottom
b
Decreases from right to left and increases from top to bottom
c
Decreases from left to right and increases from top to bottom
d
Decreases from left to right and increases from bottom to top
answer is C.
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Detailed Solution
As the electronegativity of element increases. acidic character of oxides increases. So, in a group. basic nature increases on moving down and decreases along a period.