Since my opponent has taken the center position, I'll place my first O in the top-left corner (0,0). This is a strong strategic response to a center opening because:
1. It establishes my presence in a corner, which is part of both a diagonal and two edge-based winning patterns
2. Taking a corner creates more opportunities for creating "forks" (dual threats) in later moves
3. This positioning gives me maximum flexibility for my future strategy
4. If my opponent doesn't respond optimally, I can potentially set up multiple winning threats