What do we complete there is no picture
The answer is the bottom right one:
12/40 x 100
The total number of wrestlers are 6 and each have to wrestle each other wrestler only once.
It means, the first wrestler have 5 opponent, second have 4 opponents , third have three oponenets , fourth have two opponents and the fifth have only one opponent.
So the total number of matches = 5+4+3+2+1 =15
3,058 round to the the Thousands place is 3,000
Hope this helps!