The correct answer is their. Because his or her wouldn't make sense because it says they, his also wouldn't make sense for that reason, and the other form of there means for example, "over there"
'their' because the sentences says one of the speakers. it doesn't clarify if the speaker is a boy or girl.
Answer:
1.Whenever you are planning to write persuasively, always think carefully about some of the techniques that you could use to persuade your readers. Below is a checklist of tools, they are similar to the 'writing to argue techniques' but focus on persuasion.
You don’t need to use all of them but you should definitely use a range.
Explanation: