The correct answer is B.
The Sunnah are the actions and sayings of Muhammad that are believed to complement the divinely revealed message of the Quran.
The Sunnah constitutes a source of establishing norms for Muslim conducts and makes it a primary source of Islamic law.
The Sunnah of Muhammad includes his specific words, habits, practices and silent approvals. According to Muslim belief, Muhammad was the best exemplar for Muslims and his practices are models to follow by all Muslims.