I Believe the answer would be "Which", Hope this hlps :)
Answer:
Christina is going to give a persuasive speech.
Explanation:
In her speech Christina will explain the reasons why this new method will be helpful to collect research data, she will not only give her reasons but also she will try to convince the audience on the benefits of this methods, that is why Christina will give a persuasive speech.
How about you write one about what you're going through or your feelings something you can relate to. express yourself
I'm not really sure, but I think that the correct answer would be the third option.
I hope this helps !
Please let me know if it is correct or not.