The correct answer is letter C
Sunnah means "Muslim book, which contains the sayings and deeds of Mafoma [Muhammad]". In Arabic culture, the word has the literal meaning of "trodden path", that is, the paths that were followed by the prophet, from which his traditions arose.
In addition, Sunnah has a terminological meaning that indicates all of Muhammad's approvals, sayings and achievements in more than 20 years as divine messenger. Thus, everything that involves his life forms the Suna, which must be practiced and followed by Muslims according to traditions. An example of morality for the people in question is the "hadith", the records that were validated in the path of the prophet.