challenge: Where is the source of the Drumenny Burn located?
  
  A. In the townland of Drumenny Lower, near the Donegal Town Bypass
  B. On the southern slopes of Clogher Hill, near Straness Wind Farm
  C. On the northern slopes of Clogher Hill
  D. In the townland of Barnesyneilly, on the eastern outskirts of Donegal Town
  Answer: 