In a single-elimination tournament, every match results in one player being eliminated. To determine the champion, we need to eliminate all the other players.
1. The total number of players registered for the tournament is 120.
2. In each match, one player is eliminated, so each match reduces the number of players by 1.
3. To find the champion, we need to leave only 1 player, meaning we need to eliminate 119 players.
4. Since each match eliminates one player, the total number of matches required to eliminate 119 players is also 119.
Thus, the total number of matches required to determine the champion is 119.
Therefore, the correct answer is (3) 119.