I'm choosing column 2 for two main reasons: 1) Defensively, it blocks a potential horizontal threat from my opponent who has Xs in columns 0 and 1, and might try to build toward a four-in-a-row. 2) Offensively, it builds upon my existing O piece in this column, working toward a potential vertical connect four while also creating the possibility for diagonal connections. This move balances both blocking my opponent and advancing my own position.