In periodic table, the metallic character of elements

We know that as we move along the period from left to right effective nuclear charge on valence shell electrons increases that's why tendency to lose  electrons decreases, similarly metallic character decreases.

But, down the group effective nuclear charge on valence shell electrons decreases because the outermost electrons move farther away from the nucleus that’s why metallic character increases .

Hence, from above conditions option(d) is the answer.