The correct option that describes the pattern of reactivity and electronegativity in nonmetals is:
Reactivity decreases down a group, and electronegativity decreases down a group.
However, it seems that I reiterated the same incorrect phrasing for clarity. The correct understanding is that as you move down a group in the periodic table, nonmetals tend to become less reactive and have lower electronegativity.
Apologies for the confusion! To summarize correctly:
Reactivity decreases down a group, and electronegativity also decreases down a group.
This choice captures the general trends for nonmetals in the periodic table accurately.