I'm choosing column 2 because my opponent would create a dangerous three-in-a-row if they placed their piece here. If I don't block this column now, they could place at position (2,4) and have three X pieces in a row (positions 2,3,4) at that level, which would give them multiple winning threats on their next move. Additionally, by placing here, I'm building vertically on my own pieces which could lead to a vertical connect-four opportunity in future moves.