The correct answer is C) elaboration.
During the elaboration stage of a collaborative discussion, you have the chance to add to your initial presentation points or expand on your defense.
A collaborative discussion is the kind of conversation that has a meaningful purpose to get an understanding or reaching a useful point. During a collaborative discussion, the students need to present their ideas, elaborate on them, defend them and respond to any questions. It is a great way for students to learn to elaborate on an argument and support it.