I'm choosing column 5 because it extends my current two O pieces into three in a row (positions 3-4-5 on the bottom row). This creates a strong horizontal threat that my opponent must address. If they don't block column 6 on their next turn, I'll have a potential winning move there. This move also begins to develop board control on the right side while not enabling any immediate threats from my opponent. Column 2 was another consideration to extend leftward, but I prefer extending toward the edge rather than toward my opponent's pieces.