Which is the correct subject verb agreement sentence did you know a famous animal rights activist?

This question has been rephrased in several ways, one for each distractor, in fact. They were too long to fit in the question.

See allowable question

Is_there_subject-verb_agreement_in_Did_you_know_that_a_famous_animal-rights_activist_has_criticized_horseracing_because_of_the_dangers_involved

1b. Did you know a famous animal-rights activist have criticized horseracing because of the dangers involved?

Subject-verb agreement

2a. Peer editing academic papers require critical-thinking skills and diplomacy

I didn't quite catch the meaning of your question, but the first sentence is the correct one, as the Subject (activist) and the Predicate (the Verb) are in agreement (singular).

Did you know a famous animal rights activistHAScriticized horse-racing because of the dangers involved?

subject verb agreement
Did you know a famous animal-rights activist has criticized horseracing because of the dangers involved?

Or

Did you know a famous animal-rights activists have criticized horseracing because of the dangers involved?
No. If there was one animal rights activist: "Did you know that a famous animal rights activist has criticized horse racing because of the dangers involved?"
subject agreement