A countercase appears to have the proposed cause without the claimed ruling. Which objection is most directly relevant?

Diagnosing Errors in Usuli Reasoning — Integrated Case Workshops

• Farq because a new difference between original and branch was found
• Mu-aradah because a separate competing cause was established
• Naqd: presenting a counterinstance to the alleged cause
• Fasad al-wad because the cause conflicts with the nature of the ruling