<span>Kon'nichiwa! If you need anymore help, feel free too ask me! :3
(Answer)
The answer is C. Please correct me if I am wrong.</span>
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.
B im not quite sure though