Which element is most likely to react with Br? Sr Ar O K

Br is a group VII element which is on the far right of the periodic table. It is more likely to react with elements on the far left (groups I, II, III etc). Which element is that. Actually, of those elements listed as choices, I think there are two answers.

dr bob you literally suck.

s v c k

oxygen !!

wait NO omg i meant potassium (K) !!!