Concept:A collector of sound Hadith is a scholar who compiled a book of authentic prophetic traditions.Being a narrator alone does not make someone a collector.Explanation:Abu Daud, Al-Tirmidhi, and Ibn Majah each compiled famous Hadith collections.Abu Hurayrah was a companion who narrated many Hadith, but he did not compile a book of sound Hadith.Thus, he is not a collector of sound Hadith.Answer:B. Abu Hurayrah