I agree with the person who answered this
Answer:
When writing a restrictive clause, introduce it with the word "that" and no comma. However, if the subject is or was a human being, use "who" to introduce the clause. When talking about people in defining (restrictive) relative clauses, who is preferred to that.
Answer: I would say that Daphne`s speech is more effective because it states the topic.
I hope this helps you
Isn’t this asking about your opinion of the course you took? How are other people supposed to answer that?