Concept:A da'if hadith is one classified as weak because of faults in its chain of narrators or its text.
Explanation:A hadith is called da'if when it fails to meet the conditions of authenticity.
This weakness arises from defects in its
isnad (chain of narrators) or
matn (text).
Such defects may include a missing narrator, a unreliable transmitter, or an error in the text.
It is not necessarily fabricated; fabrication has a separate ruling called
mawdu.
Therefore, the correct reason is the presence of defects in both the chain and the content.
Answer:C. It has defects in its isnad and matn.