In the periodic table, similar acting items are found in A. Vertical columns of groups

B. Horizontal rows of periods

C. Both rows and columns

D. Alphabetical order

Its a hope this

So the main goal for the elements is stability which is a complete/full valence shell and typically the magic number for a stable element is 8 valence electron but not always. so elements to the left of the periodic table tend to be way less stable then those on the right, so the elements on the left are much more reactive.

Sorrr but idk whats its abou 9

The answer would be b