challenge: What route runs along the northern flanks of Taer Carn Uchaf?
  
  A. The Beacons Way from Llangadog to Abergavenny
  B. The Welsh Way from Newport to Swansea
  C. The Brecon Beacons Trail from Merthyr Tydfil to Neath
  D. The Beacons Way from Brecon to Cardiff
  Answer: 