Which sentence would be the topic sentence in a paragraph about a school athletic team?

our softball coach once played on the olympic team.

last year, the softball team won the city championship.

three of our current softball players have received scholarships to play in college.

our school’s softball program has a tradition of excellence.

"Our school's softball program has a tradition of excellence." Makes the most sense as a topic sentence. 
The first sentence only talks about the coach of the team, so this is incorrect.
The second sentence only talks about one game that was won by the team.
The third sentence only talks about three of the players on the team.

Hope this helps! (: