Answer:
Option B
Explanation:
(i) matches of the first player with other 4 players
(ii) matches of the second player with 3 players other than the first player
(iii) matches of the third player with 2 players other than the first and second players
(iv) match the fourth player with one player other than the first three players. So, number of matches played during the to[rnament =4 +3 +2 + 1= 10.