I analyzed the board: I already have an O at (2,5) and one at (3,4), which form a promising diagonal. By playing in column 2, my piece will land in row 4 (since row 5 is already occupied in column 2), joining my other piece in row 4 (at column 3) to create a horizontal pair. This move also builds a vertical stack in column 2 and helps set up multiple potential winning threats without giving the opponent an immediate advantage. Therefore, I choose column 2.