Prophethood commentary (necessity and quanty)

Besides conveying Quran verses, explaining them was undertaken o prophet Muhammad (SA) by God. There are 3 theories about the amount of explained verses by prophet Muhammad (SA) as follows; a) a few verses, b)most of verses, and c)all of verses. What historical evidences and intellectual-speech reasons indicate is descending Quran accompanying with the tradion (Sunnah); i. e. all of verses were explained by prophet Muhammad (SA) and aer that by his infallible seed. However, it is necessary to menon the lack of prophethood commentaries quotaon, not issue norm of prophethoodcommentaries.