Concept:Hadith authenticity is graded in levels, with Sahih as the highest and Da'if as the lowest among the main categories.Explanation:In the science of Hadith, the strongest classification is Sahih (authentic). The next level in authenticity is Hasan (good/fair). Hasan is followed by Da'if (weak). Qudsi and Muttasil describe types of narration, not levels of authenticity. Since the question asks what comes after Sahih in rank, Hasan is the correct choice.Answer:B. Hasan