I'm choosing column 4 because it creates multiple strategic advantages. First, it starts building a potential horizontal line from my existing piece at column 2. Second, it prevents my opponent from easily creating a diagonal threat through column 4. Third, it creates my own potential diagonal opportunity. While my opponent has started building vertically in column 3, they aren't close to connecting four yet, so there's no immediate need to block there. By playing in column 4, I'm developing my position while maintaining flexibility for future moves.