for the winning group Shall we give it as candy? It is like saying that if team members can do well, they will receive a reward. To be an inspiration for doing next time.
Do we provide candy for the winning team? It's like saying that if team members perform well, they will receive rewards. Become the driving force for the next step.
Shall we give the winning team a candy? This is like saying that if the magic in the team can be done well, it will be rewarded to motivate it to do it next time.