That's How You Prevent A Fork

Logic Level 1

It is \(O\)'s move in the Tic-Tac-Toe game (above). Which of the moves gave above (1, 2, 3, 4, 5) is the best move for \(O\)?

Assume both players intend to win the game and plays optimally.


Source: University of South Carolina High School Math Contest, 1991
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