challenge: What was the result of the slurry leak from a farm near Blarney into the River Martin and subsequently the River Shournagh in June 1996?
  
  A. Improved water quality in the river
  B. Increased population of trout and salmon
  C. No significant impact on the river's ecosystem
  D. More than 3,000 fish (trout and salmon) died of oxygen deprivation
  Answer: 