Concept:Asmā' ar-rijāl is a specialized knowledge used in the science of Hadīth criticism.
Explanation:Asmā' ar-rijāl literally means "names of men."
It deals with the biographies, identities, and reliability of Hadīth narrators.
Scholars use this field to verify the chain of transmission for each Hadīth.
Through it, they distinguish authentic narrations from weak or fabricated ones.
Thus, it belongs to the discipline of Hadīth studies, not jurisprudence, Usūl, or general history.
Answer:D. Hadīth