It’s all of them because you need them in all of the speeches you configure to write or say
What do you want us to do?
I think the answer is while because you can’t start a sentence with because
I don't know if you have read any of my answers like this but you need to re read the story and then answer the questions cause i am not going to help you on the stupid questions like this. I used to do this but then someone told me what I am telling you so please do take these ideas. Hope it helps!!! Good Luck!!!!!