Since my opponent has taken the center position, I'll place my O in the top-left corner (0,0). This is a strategic choice because:

1. When the opponent starts in the center, taking a corner gives me the potential to create multiple winning paths later.
2. This move starts building a potential diagonal win from top-left to bottom-right.
3. It also opens possibilities for winning along the top row or leftmost column.
4. If my opponent doesn't respond optimally, this position may allow me to create a fork (two potential winning lines) in my next move.

Playing in a corner is generally a strong response when the opponent takes the center in Tic-Tac-Toe.