Concept:The correct word must describe evidence whose truth cannot be denied or disproved.
Explanation:"irrefutable" means impossible to deny or disprove.
The truth of evidence is something that cannot be challenged, so "irrefutable" fits perfectly.
The other options do not match the context:
"irreversible" means cannot be undone.
"irreparable" means cannot be repaired.
"irretrievable" means cannot be recovered.
Only "irrefutable" matches the idea of undeniable evidence.
Answer:B. irrefutable