I see that I have two O pieces in a row at the bottom in columns 2 and 3. By playing in column 4, I can extend this to three in a row, creating a strong horizontal threat. My opponent has two X pieces directly above my pieces, but they don't have any immediate winning threats I need to block. Playing in column 4 gives me the best offensive position without setting up an easy play for my opponent. This move also maintains flexibility for future plays in multiple directions.