B.
until - until he comes for example ( time before someone comes or something is happened)
Meanwhile - during a period or an action where another thing is happening (at that time)
Later - after some period - two months later ( after passing of some amount of time
Nakisha and Samir are making an effective use of presentation skills. Both are defending their ideas and persuading the others to follow them, by showing their knowledge about the topic with examples, and making the other students agree with them by using their ideas as well.
Mark, Casey and Kara are not so effective as they are not approaching the conversation properly, paying close attention to the questions given, or defending their own opinion.
Answer:
In order to give background info
Explanation:
You will always need background info when finding the exposition