The sentence with correct subject-verb agreement is:
The team of players is practicing hard for the game.
The other sentences contain errors in subject-verb agreement:
- "She were excited about the school trip." should be "She was excited about the school trip."
- "They does their homework before dinner." should be "They do their homework before dinner."
- "The dogs barks loudly every night." should be "The dogs bark loudly every night."