How many different Catholic denominations can we agree on?
Depends I guess (on how one defines “Catholic”) but if one defines “Catholic” as those churches in communion with the Bishop of Rome (the Pope) the answer to your question to me would be: none.
I think what they are looking for is something like this:
-Protestants: includes Church of England, Anglican, some Lutheran
-Evangelicals: most others make this up to include most Baptists.
-Others: