Following statement regarding the periodic trends of chemical reactivity of alkali metals and halogens are given. Which of these statements gives the correct picture?

Chemical reactivity increases with increases in atomic number down the group in both the alkali metals and halogens

In alkali metals, the reactivity increases but in the halogens, it decreases with increases in atomic number down the group

The reactivity decreases in the alkali metals but increases in the halogens with increases in atomic number down the group

In both, alkali metals and halogens, chemical reactivity decreases with increases in atomic number down the group