سوال ۳ کنکور ارشد علوم کامپیوتر ۱۳۹۹

The speaker did not understand a part of the lesson and asks for it to be gone over again, briefly stating the main points. Recapitulate means to summarize and restate the main points of something, which exactly fits re-explaining a lesson. Identify (recognize/name) and postulate (assume/claim something as true) do not fit. Recount means to narrate or tell a story of events, which is about telling a tale, not summarizing/re-explaining a lesson, so it is a distractor.