By dropping my piece in column 2, I will have O pieces at row 4 in columns 2, 3, and 4, forming three in a row horizontally. This creates two simultaneous winning threats on my next move – I can win by dropping in either column 1 (to extend the sequence to the left) or column 5 (to extend it to the right). My opponent can only block one of these two threats, ensuring a forced win. Therefore, column 2 is the best move.