Answer:
D.Wishing your opponent good luck before the game starts.
Step-by-step explanation:
sportsmanship is a nice way to help other people and even if you lose the other team should say good game and the same thing goes for the other team if your team wins the other team should say good game.
Wishing your opponent good luck before the game starts is a good way to show kindness to the other opponent before the game starts