Correct option is A
As we move from left to right across a period in the periodic table, the atomic number increases, which generally leads to an increase in the effective nuclear charge.
This causes the electrons to be pulled closer to the nucleus, reducing the atomic radius. As a result, the metallic character decreases, and elements become more non-metallic.
This trend is evident in elements where metals are found on the left side of the period, and non-metals are on the right.
